EP0963822A2 - Device and method for subdividing logs - Google Patents

Abstract

At least one additional band-saw unit (26) is provided next to the first band-saw unit (24) and like the first unit it also has a band-saw blade (38) with teeth oriented in both directions. The second band-saw blade is vertically offset from the first band-saw blade (36) by a distance equal to the width of one of the boards. A drive mechanism (28, 30) is provided for each band-saw unit, capable of moving the two units away from each other at right angles to the direction of the tree trunk conveyor when this direction is changed. An Independent claim is also included for a method for sawing up tree trunks into boards.

Description

The invention relates to a device for cutting tree trunks in boards, with one in two opposite directions reciprocating longitudinal conveyor for the tree trunks and with a band saw unit, which is arranged on the longitudinal conveyor and its band saw blade aligned in the directions is serrated in both directions.

The invention further relates to a method for dividing tree trunks in boards, conveyed on a longitudinal conveyor which the tree trunks in several passes in opposite each other Direction by means of one oriented in the directions and sawed bandsaw blade serrated in both directions become.

A device and a method of the aforementioned type are known.

If you use a band saw unit to cut tree trunks a single band saw blade, so are different Configurations possible. The band saw blade can e.g. just be serrated on one side. You then need one to split it up Tree trunk in n boards a total of n + 1 saw cuts. About that In this case, the tree trunk must go after each pass through the band saw unit e.g. via a round trip again the starting position is placed in front of the band saw unit, so that a second pass can follow.

It is alternatively known, additionally on one or both sides Span heads to provide with the so-called rinds on both sides of the tree trunk. In this way a saw cut is saved on both sides, so that only n - 1 cuts are required.

It is also known alternatively to use band saw blades, which are serrated on both sides. Then the tree trunk must be on one Longitudinal conveyors are conveyed in opposite directions can be operated back and forth. Under "longitudinal conveyor" is preferably a block band saw carriage known per se understand that is axially movable on a rail. Of the Tree trunk becomes one-sided on the log band saw carriage, namely on the long side opposite the band saw by means of so-called Clamps held at the same time, a certain orientation of the tree trunk on the log band saw carriage. In this way, the time to perform the entire cutting process can be significantly reduced However, this does not change the number of saw cuts, either then not if in a further alternative embodiment also in In this case, span heads arranged on both sides are used.

It is also known from sawmill technology, so-called Tandem units to use, where two band saw blades are provided, which are perpendicular to the conveying direction of the longitudinal conveyor are spaced, usually by the width of a board. The two bandsaw blades are common staggered, i.e. they are also in the direction of conveyance of the longitudinal conveyor offset against each other. During the run of the tree trunk then comes the one further out Band saw blade and then the inner one offset by a board thickness Band saw blade engaged.

For this reason, it is not possible to use such tandem units to be used with band saw blades toothed on both sides. When the tree trunk returns, that would be the case now first engage the inner band saw blade at the front, which is not possible for manufacturing reasons is.

The invention has for its object a device and to further develop a method of the type mentioned at the beginning, that the disadvantages mentioned above are avoided. In particular, a significant increase in performance is aimed at conventional devices can be achieved.

In the case of a device of the type mentioned at the beginning, this is Object achieved in that along the direction in addition to the band saw unit, at least one further band saw unit with also aligned in the directions and serrated band saw blade is arranged around the Width of a board perpendicular to the first band saw blade is offset to the direction, and that each band saw unit a traversing device is assigned, by means of which the band saw units when changing the direction of the longitudinal conveyor are adjustable in opposite directions perpendicular to the direction.

In a method of the type mentioned in the beginning, the task solved according to the invention in that the tree trunks at the same time by means of another, also oriented in the directions and sawed bandsaw blade serrated in both directions be that the width of a board compared to the first Band saw blade is offset perpendicular to the direction, and that at every time the direction changes, the band saw blades are perpendicular to Direction can be adjusted.

The object on which the invention is based is achieved in this way completely solved.

According to the invention, namely, each time the direction of the Longitudinal conveyor the radial position of the band saw blades relative to Axis of the longitudinal conveyor interchanged, such that the previously inner one Band saw blade now moves into the outer position and vice versa. As a result, when the tree trunk returns, it initially gets caught the band saw blade now on the outside, the one at the forward was engaged first, as desired becomes.

The band saw units are for this purpose with the mentioned Moving devices provided, a variety of embodiments is conceivable. So can be provided in an extreme case be two completely independent band saw units with two as well to provide independent moving devices that only can be operated in push-pull mode via a common controller. Alternatively, however, combined units are also conceivable, where e.g. a common drive motor for both band saw blades is used and yet a common moving device, which only has a suitable swivel gear desired alternating movement of the band saw blades.

In preferred embodiments of the invention is in itself provided in a known manner, the tree trunks at least initially to be machined on one side, which is why they are also known Span heads are provided on the side of the longitudinal conveyor.

There are various types of cutting the tree trunks into boards Cutting sequences conceivable. As part of these cutting sequences it may be useful to change the tree trunks at one of the directions of the longitudinal conveyor by 180 ° about its longitudinal axis. This way it is easier to just put the logs on band saw unit arranged in one side of the longitudinal conveyor Bring intervention.

It is further understood that within the scope of the present invention also more than two band saw blades under the corresponding Position changes can be used. Jumps are also over integer multiples of board thicknesses when adjusting the band saw blades conceivable in the radial direction. Finally, you can the band saw blades can also be adjusted radially by any amount when wood products of different thicknesses are produced boards, planks and beams.

Further advantages result from the description and the attached one Drawing.

It is understood that the above and those below Features to be explained not only in the specified Combination, but also in other combinations or can be used alone, without the scope of to leave the present invention.

Fig. 1

eine äußerst schematisierte Draufsicht auf ein Ausführungsbeispiel einer erfindungsgemäßen Sägewerksanlage, in einer ersten Arbeitsstellung;

Fig. 2

die Sägewerksanlage gemäß Fig. 1, jedoch in einer zweiten Betriebsstellung; und

Fig. 3 bis 5

drei schematisierte Darstellungen zur Erläuterung einer Folge von Sägeschnitten nach drei unterschiedlichen Ausführungsbeispielen der Erfindung.

Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description. Show it:

Fig. 1

an extremely schematic plan view of an embodiment of a sawmill system according to the invention, in a first working position;

Fig. 2

the sawmill system of Figure 1, but in a second operating position. and

3 to 5

three schematic representations to explain a sequence of saw cuts according to three different embodiments of the invention.

In Fig. 1 is a total of 10 sawmill, more precisely said a section of an overall sawmill system. In the sawmill 10, tree trunks should be Band saws are divided into boards.

A longitudinal conveyor of the sawmill system, generally designated 11 10 preferably comprises a block band saw carriage known per se 12 on a guide rail 13 in two opposite directions Directions can be moved, such as with a double arrow 15 indicated. On the block band saw carriage 12 is located in Fig. 1 shows a tree trunk 14a, which is conveyed to the left in Fig. 1 is, as indicated by an arrow 16a. The tree trunk 14a is by means of so-called clamps 17 on one long side Log band saw carriage 12 held.

The tree trunk 14a is located in Fig. 1 in the conveying direction shortly before a Spanerkopf 18, the individually or in pairs 18, 18 'arranged on one or both sides of the longitudinal conveyor 12 is. The Spanerkopf 18 is perpendicular to the conveying direction standing axis 20 rotatable, as indicated by an arrow 22. The Spanerkopf 18 serves in a manner known per se for chipping the so-called "rind", i.e. the farthest external bark section of the tree trunk 14.

After passing the span head 18, the tree trunk 14a arrives in the area of two band saw unit 24, 26 in the conveying direction are arranged one behind the other. The band saw units 24, 26 are on the side opposite the jacks 17 the block band saw carriage 12 is arranged.

The band saw units 24, 26 are designed to be movable, and also in a direction perpendicular to the conveying direction of the longitudinal conveyor 11. Two fixed displacement devices 28, 30, for example fluidically operated piston-cylinder units provided to the band saw units 24 and 26 in the mentioned Adjust the direction of travel, as with double arrows 32 and 34 indicated.

In the operating position shown in Fig. 1 is the first Band saw unit 24 a little more from the block band saw carriage 12 or spaced from the tree trunk 14a as the second band saw unit 26. The difference in distance of the band saw units 24, 26 from Longitudinal conveyor 12 corresponds exactly to the width of one to be sawn Boards, as will be explained.

The band saw units 24 and 26 are each with a rotating Band saw blade 36 or 38 provided. Since these are in the same Positioned on the band saw units 24, 26 has 1, the first band saw blade 36 consequently a distance from the block band saw carriage that is one board thicker 12 as the second band saw blade 38.

If the tree trunk 14a now after passing the span head 18 arrives in the area of the band saw units 24, 26 consequently, first through the first band saw blade 36 external cut made in tree trunk 14a, while only then a little further through the second band saw blade 38 internal saw cut is generated.

When the tree trunk 14a the band saw units 24, 26 completely has happened is in the working position shown in Fig. 2 the conveying direction of the longitudinal conveyor 11 switched, so that it now runs from left to right in Fig. 2. This is indicated by the arrow 16b in the tree trunk 14b in Fig. 2.

At the same time, the movement devices 28, 30 were in the way actuated that now the second band saw unit 26 the larger Distance from block band saw carriage 12 occupies while the first Band saw unit 24 moved closer to the block band saw carriage 12 has been. The distance between the band saw blades 36, 38 to each other corresponds again to the thickness of one to be sawn Boards. The band saw blades 36 and 38 are in both directions toothed towards, as shown in FIGS. 3 to 5 in detail is recognizable. This means that the band saw blades 36 and 38 used sawing from both the right and left in Fig. 1 can be.

In addition, tree trunk 14b was either unidirectional adjusted perpendicular to the conveying direction of the longitudinal conveyor 11 or the band saw units 24, 26 were jointly on the Log band saw carriage 12 to be adjusted. In this way it was achieved that by the band saw blades 36, 38 two more Cuts are made at two further positions of the tree trunk 14b are, as explained below with reference to FIGS. 3 to 5 will be.

The game explained above, being after walking past of the tree trunk 14 on the band saw units 24, 26 both the Direction of conveyance of the longitudinal conveyor 11 switched as well radial position of the band saw units 24, 26 and / or the Tree trunk 14 is adjusted, is now repeated if necessary several times, as also explained with reference to FIGS. 3 to 5 will be until the tree trunk 14 finally in the desired number of boards is disassembled.

3 to 5 are three different according to the invention Procedure for sawing the tree trunks 14 shown. Each 3 to 5 on the left are the two toothed on both sides Band saw blades 36 and 38 are shown, wherein in the 3 and 4 only these band saw blades 36, 38 are used 5, while in the case of FIG. 5 additionally the chipper 18 or the chipper 18 and 18 'on both sides of the Longitudinal conveyor 11 are provided.

A radial section through the tree trunk 14 is shown in the right-hand part of FIGS. 3 to 5. In the illustrated embodiment, a total of seven boards a, b, c, d, e, f, g are to be produced. The rinds S ₁ and S ₂ on both sides are to be removed. The sawing operations, ie the passages of the tree trunk 14 past the band saw units 24, 26, are designated by Roman numerals I ...

In the embodiment according to FIG. 3, the rind S _{1 is cut} off in the first pass I with the second band saw blade 38, while the first band saw blade 36 runs past the rind S ₁ on the outside. In the second round II, the first two boards a and b are separated. The tree trunk is now turned on the block band saw carriage 12, ie rotated by 180 ° about its longitudinal axis, as shown by a dash-dotted line in FIG. 3. Consequently, in the third pass III, only the opposite rind S _{2 is cut} off, by means of the first band saw blade 36, while the second band saw blade 38 runs past the rind S ₂ on the outside. The third round III takes place again as shown in FIG. 1.

In the fourth round IV, the boards f and g are sawn off, while in the fifth round V the boards c, d and e are generated.

In this embodiment, compared to a configuration, in the case of a band saw blade with a toothing on one side only sawed, a productivity increase of 73% was achieved.

In the first modification of this method, which is shown in FIG. 4, both the rind S ₁ and the first board a are separated in the first pass I. When returning, boards b and c are sawn off in the second round II. The tree trunk is then turned again on the log band saw carriage 12, so that both the second rind S ₂ and the board g can be sawn off in the third pass III. In the fourth round IV, boards d, e and f follow.

This embodiment of the invention is compared with the already mentioned state of the art an increase in productivity achieved by 110%.

In the further variant according to FIG. 5, the span heads 18 and 18 'already described for FIGS. 1 and 2 are finally used. Then a total of three passes I, II and III (with a turning of the tree trunk 14 after the passage II) are sufficient to saw all seven boards a to g, the rinds S ₁ and S ₂ before the first passage through the band saw units 24 and 26 were machined.

In this case the productivity increase is 129%.

Claims (6)

Device for cutting tree trunks (14) into boards (a, b, c, d, e, f, g), with one in two opposite Directions (13) reciprocating longitudinal conveyor (11) for the tree trunks (14) and with a band saw unit (24) which is arranged on the longitudinal conveyor (12) and its band saw blade aligned in the directions (13) (36) is toothed in both directions, characterized in that that along the direction next to the band saw unit (24) at least one further band saw unit (26) with also aligned in both directions and on both sides serrated band saw blade (38) is arranged around the width of a board (a, b, c, d, e, f, g) opposite the first band saw blade (36) offset perpendicular to the direction and that each band saw unit has a moving device (28, 30) is assigned, by means of which the band saw units when changing the direction of the longitudinal conveyor (11) are adjustable in opposite directions perpendicular to the direction. Device according to claim 1, characterized in that along the direction next to the band saw units (24, 26) at least on one side of the longitudinal conveyor (11) Spanerkopf (18, 18 ') is arranged. Process for dividing on a longitudinal conveyor (12) supported tree trunks (14) in boards (a, b, c, d, e, f, g), in which the tree trunks (14) in several passes (I, II, III, IV, V) in opposite directions by means of one oriented in both directions Sawn in the direction of toothed band saw blade (36), characterized in that the tree trunks (14) at the same time by means of another, also in the directions aligned and serrated bandsaw blade (38) sawn by the width of a Boards (a, b, c, d, e, f, g) opposite the first band saw blade (36) is offset perpendicular to the direction, and that the band saw blades (36, 38) can be adjusted perpendicular to the direction. A method according to claim 3, characterized in that the Tree trunks (14) before reaching the first band saw blade (36) must be machined at least on one side. Method according to claim 3 or 4, characterized in that that the band saw blades (36, 38) when changing the direction of the Longitudinal conveyor (11) in opposite directions by one board width be adjusted. Method according to one or more of claims 3 to 5, characterized in that the tree trunks (14) when changing direction the longitudinal conveyor (11) by 180 ° to your Longitudinal axis can be turned.

Images