AT16136U1 - Apparatus for cutting bundled wood - Google Patents

Abstract

The invention relates to a device for cutting bundled wood with at least one device for holding (11; 9) a bundle (22) and a device for sawing (15; 25, 26) the bundle (22). In order to prevent jamming of the saw, the at least one holding device (11) and / or the sawing device (15; 25; 26) is / are rotatable about the longitudinal central axis (29) of the at least one holding device (11) ; 9).

Description

description

The invention relates to a device for cutting bundled wood to length according to the preamble of claim 1.

Tree branches that occur when felling trees, but also whole trees, are usually cut to a length of 100 cm for storage, drying and as preparation for further processing and, for example, with the help of plastic strips to bundles of logs with a diameter of summarized about 115 cm. But even thicker logs, which are intended as firewood, are cut into pieces of 100 cm, split and also combined into bundles. The wood bundled in this way is then stored until a moisture content is reached which, for example, enables further processing into firewood.

For this purpose, the bundle must be cut. Firewood lengths of approx. 50, 33 and 25 cm are common. In the first case, the bundle only needs to be divided with a cut in the middle, in the second case two and in the third case three cuts are necessary.

A chainsaw with a chainsaw sword of at least 120 cm is usually used for the cuts. But even with very strong saws, problems arise: Bundling forces the individual branches or gaps together. Since the branches and logs have different strengths and are not straight, there are extremely complex tensions within the bundle.

These tension ratios change during the saw cut. As a result, parts that have already been cut move into a different position and it often happens that the cut surfaces of the wooden parts in their changed position clamp the saw chain sword.

These frequent jams can only be solved manually with great effort and a lot of time.

The invention has for its object to design a device for cutting bundled wood so that the risk of such jamming is reduced or jamming can even be avoided entirely.

The object is achieved according to the invention by a device with the features of claim 1. Characterized in that the at least one device for holding and / or the device for sawing are / is arranged rotatable about the longitudinal central axis of the at least one device for holding , already cut pieces of wood fall to the floor and can no longer cause jamming.

The saw therefore only has to be actually moved through the wood over a small cutting depth, which is generally only slightly larger than the diameter of a branch or log. Otherwise the saw is free on one side and the other side is only moved past the cut surfaces of the wood that is still held. In this way, jams can be prevented with great certainty.

As the longitudinal central axis of the at least one device for holding, the central axis of the bundle of wood should hold in its held position.

In one embodiment of the invention, the at least one device for holding is rotatably arranged. In the sense of a simple and inexpensive construction, the device for holding is preferably stored so that a slight 360 ° rotation is possible. The device for holding can then be turned back. However, more complex constructions are also feasible, which enable the device to be rotated for holding.

In another embodiment, the device for sawing is rotatably mounted around the bundle. There is also the possibility of a back and forth rotation here, but there are

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Patent office also possible designs that allow the sawing device to spin.

Of course, there is also the possibility to store both the device for holding and the device for sawing in a rotary manner and to rotate both devices against one another during the saw cut. In this case it is sufficient if each of the two devices only rotates by approximately 180 °.

Further details and advantages of the invention emerge from the subclaims.

Because cut wood falls off the bundle, it is possible to use a circular saw with a relatively small blade. The saw blade only has to protrude so far beyond the motor block of the circular saw that the thickest branches and logs in the bundle can be cut. If the motor block of the circular saw is on the side of the saw blade that lies opposite the bundle fixed with the holding device, the movement of the saw in the direction of the central longitudinal axis is not hindered.

In another embodiment of the invention, the device for sawing has a chain saw with a saw chain and guide for the saw chain. Since there is practically no jamming of the guide here, a relatively small drive is sufficient.

Since with a chainsaw the guide for the saw chain, the so-called sword is usually attached centrally to the drive block, care must be taken to ensure that the drive block is located outside the outer circumference of the bundle in every position of the saw. So that the whole bundle can still be cut with the saw, the sword should be longer than the radius of the bundle. The device for sawing is advantageously dimensioned such that the length of the saw cut is less than the maximum diameter of the bundle.

The device should also be able to carry out several cuts in one and the same bundle. This is important if, for example, firewood with a length of 33 or 25 cm is required. In this case two or three cuts are necessary. The at least one device for holding and the device for sawing are therefore advantageously displaceable relative to one another in the direction of the longitudinal central axis of the at least one device for holding. In one embodiment, the device for sawing can consequently be displaceable, whereas in the device for holding, no displacement is possible. Conversely, the device for holding can also be displaced and the device for sawing can be made immovable. Of course, however, both devices can also be designed to be displaceable.

In order to be able to sever the bundle in its full thickness, the at least one device for holding and the device for sawing on an axis perpendicular to the longitudinal central axis of the at least one device for holding are advantageously movable towards and away from one another. Here, too, it is again possible to design only the device for sawing, only the device for holding, or both devices to be movable accordingly.

In another embodiment, neither the sawing device nor the holding device is moved linearly. In this case, the device for sawing is advantageously pivotably mounted in a plane that is spanned perpendicular to the longitudinal central axis of the at least one device for holding.

Particularly advantageously, the at least one device for holding a pair of pliers. In such pliers for holding logs or logs, a fixed lower part is usually provided, which extends approximately over half the circumference of the bundle. A movable upper part is pivotally attached to the fixed lower part and is movable by a drive. When the upper part is open, a bundle can be easily inserted into the pliers. To fix the bundle, the upper part is closed and together with the lower part forms a firm ring around the bundle.

The at least one device for holding and the device for are advantageous

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Saws can be driven hydraulically or electrically. The type of drive should be based on use. Is the device as a mobile device such. B. mounted on a truck, a trailer or in an open container, a hydraulic drive is usually advantageous. Even if the device is designed as a front or rear attachment to a loader, a hydraulic drive with a direct connection to the hydraulics of the loader can be used. In the case of a stationary device, on the other hand, an electric drive will be more advantageous.

In wood bundles with very crooked branches, it can happen that a pair of pliers is not sufficient to hold the bundle. Since the tongs have to grip in the last third or even in the last quarter of the bundle when producing firewood with a length of 33 cm or 25 cm, it can happen that the bundle fanned out very wide at the opposite free end and a clean cut becomes practically impossible.

For such cases, it is advantageous to provide a further device for holding with another pair of pliers, the two devices for holding having the same longitudinal central axis, the two pliers being operable independently of one another and the spacing of the pliers along the longitudinal central axis being variable. In this way, one of the pliers can be positioned close to the cut before each cut, thus preventing the bundle from fanning out in an unordered manner.

In terms of design, it is difficult and complex to design both devices for holding them to be displaceable and rotatable. It is therefore particularly advantageous for one of the devices for holding to be rotatable and for the other device for holding to be displaceably arranged along the longitudinal central axis. In this way, the bundle can be brought into a position by the displaceable holding device in which the cut can be carried out near the pliers of the rotatable holding device. During the cut, the bundle is then only held by a pair of pliers, but since it is close to the cutting position, strong fanning out at this cutting position is prevented.

Further details and advantages of the invention will become apparent from the description of exemplary embodiments, which are explained in detail with reference to the drawing.

[0027] It shows:

Figure 1 2 shows a schematic side view of an exemplary embodiment according to the invention with pliers for holding a bundle of wood, Figure 2 Figure 3 the embodiment of FIG. 1 seen in the direction of arrow A, 1 shows a schematic side view of a further exemplary embodiment with two pliers for holding a bundle of wood in a state after the bundle of wood has been inserted, Fig. 4 Fig. 5 Figure 6 3 during a first cut, 3 before the last cut, the rotation ring with the rotation tongs from the embodiment of Figures 3 to 5, Fig. 7 the pliers stand for the linear pliers from the embodiment of Figures 3 to 5 and Fig. 8 the motor stand with the rotating ring for driving the rotary tongs from the embodiment of Figures 3 to 5.

In Figures 1 and 2, an embodiment of the invention is shown, which is equipped with a rotating pliers 11 and a linearly movable and pivotable circular saw 25, 26. The circular saw with the circular saw blade 25 and the circular saw drive 26 is fastened to a swivel lever 27. The swivel lever 27 is in turn connected to a swivel drive 28 which is mounted on the linear guide 23 so as to be horizontally displaceable. The linear guide 23 is connected to the base plate 1 via the linear guide stand 24. The

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Drive for the horizontal displacement of the circular saw 25, 26 is not shown here, but can be implemented, for example, with a toothed belt.

To hold the log bundle 22, the rotary tongs 11 are provided. This has a pliers lower part 18 and a pivotable plier upper part 17 connected thereto via the plier hinge 19. The lower part of the pliers 18 is firmly connected to the rotating ring 5 via the connecting rods 13. Since there is no connection between the upper jaw part 17 and the rotating ring 5, the upper jaw part 17 can be opened and closed via the tong hinge 19.

The rotary ring 5 is rotatably supported on the base plate 1 via a roller bearing 6 and connected via the turnstile 20 to the motor axis 21 of the rotary motor 4. The rotary motor 4 is anchored to the motor fastening strut 3 and thus fixed to the base plate 1 via the motor stand 2.

In order to cut a bundle of logs or logs, the upper part of the pliers 17 is now pivoted into its open position via the tong hinge, so that a bundle of logs or logs 22 can be inserted into the lower part 18 of the tong. Then the upper part of the pliers 17 is pivoted back again and the rotating pliers 11 are thereby closed. The bundle of rods or billets 22 is now held in the rotary tongs 11 with great force. This position is shown in Fig. 1.

Now the circular saw 25, 26 is moved via the linear guide 23 into the position for the first cut, the circular saw drive 26 is started and the circular saw blade 25 is lowered via the swivel drive 28 onto the bundle of logs or logs 22. Now the rotary motor 4 is also put into operation, so that the rotary tongs 11 begin to rotate together with the clamped bundle of rods or logs 22.

It is possible to synchronize the swivel drive 28 with the rotary motor by coupling the swivel drive 28 directly to the rotary motor 4 and the circular saw blade 25 at a certain angle of rotation of the rotary motor 4 also continuously by a certain amount during the rotation of the rod or log bundle 22 is lowered. However, it is also possible to carry out a full rotation of the rotary motor 4 while the circular saw blade 25 remains in the same position, and to start the rotary drive 28 again only after the rotation has been completed and to lower the circular saw blade 25 by a further step.

Due to the rotation of the bundle of logs or logs, already cut logs or log pieces fall to the ground. In this way, the circular saw blade can penetrate deeper with each rotation of the bundle of logs or logs, without the circular saw drive 26 being blocked during this movement.

As soon as the circular saw blade 25 is in the position shown in dashed lines, the bundle of rods or logs 22 is completely severed at this cutting position. The circular saw 25, 26 is now raised again into the solid position by the swivel drive 28 and can be moved into the next cutting position via the linear guide 23.

Figures 3 to 8 show a further embodiment of the invention, which works with two pliers, that is, a horizontally displaceable linear pliers 9 and a rotating pliers 11. In the two exemplary embodiments, identical components are provided with the same reference symbols.

The rotary motor 4, the motor mounting strut 3, the motor stand 2 and the rotating ring 5 are formed in the same manner as in the embodiment described above. The rotating pliers 11 are here but not directly attached to the rotating ring 5 with the pliers lower part 18 but to the rotating disk 12. This rotary disk 12, like the rotating ring 5, is rotatably mounted on the base plate 1 via a roller bearing 6 and has a cutout which is somewhat larger than the inner contour of the closed rotary tongs 11

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The connecting rods 13, which connect the rotating ring 5 with the rotating disk 12 in this embodiment, are designed so long that a bundle of rods or firewood 22 can be conveniently placed between the rotating ring 5 and rotating disk 12 without fear of jamming of the bundle must become. The pliers stand 7 is fixedly mounted on the base plate 1 approximately in the middle between the rotating ring 5 and the rotating disk 12. It has guide openings for the push rods 8, which are attached to the linear pliers 9.

The linear pliers 9 is mounted on wheels 10 or rollers in order to be able to move them horizontally. The horizontal displacement can be implemented, for example, via a linear drive which is provided in the clamp stand 7 and acts on the push rods 8.

In this embodiment, a chainsaw 15 is provided as a sawing device. It is attached to a saw guide 14 anchored vertically on the base plate 1 and can be moved in a vertical direction on the saw guide 14. The length of the chain saw blade is dimensioned such that the free end extends beyond the middle of the bundle of logs or logs 22.

In order to insert a bundle of rods or billets, only the linear pliers 9 are fully opened. If the bundle is inserted, the linear tongs 9 are closed and the rotary tongs 11 are opened slightly. This position is shown in Fig. 3. By shifting the linear pliers 9, the right end of the bundle of rods or logs 22 can now be pushed through the opening in the rotating disk 12 and through the slightly opened rotating pliers 11.

As soon as the first cutting position is reached under the chainsaw 15, the linear pliers 9 are stopped. Then the rotary tongs 11 are closed and the linear tongs 9 are opened a little. The bundle of rods or billets is now held exclusively by the rotating pliers 11, while it merely rests on the lower part of the pliers of the linear pliers 9 and the pliers stand 7.

Now the chainsaw 15 is activated and lowered on the saw guide 14 until the chain penetrates into the wood. Now the rotary motor 4 is also put into operation, so that the rotary tongs 11 begin to rotate together with the clamped bundle of rods or billets 22. This is possible because the bundle of rods or billets is not held in the linear pliers 9, but only lies loosely on the lower part of the pliers and the pliers stand.

The lowering of the chainsaw 15 can - as already explained in the first embodiment - take place in stages or continuously, in each case coordinated with the angle of rotation of the rotary motor 4. The cut is terminated as soon as the chainsaw 15 has been lowered down over the longitudinal central axis of the bundle of logs or logs. In Fig. 4 a position is shown in which this cut is made approximately in half.

In order to be able to position the bundle of logs or logs 22 for the next cut under the chainsaw 15, the rotary motor 4 is stopped and the chainsaw 15 is moved into its starting position. Now the linear pliers 9 move back into a position in which the bar bundle 22 can still be fixed by the linear pliers 9. Then the linear tongs 9 are closed and the rotary tongs 11 opened.

If the linear pliers 9 are now moved to the right again, the bundle of rods or logs 22 is also moved to the right. This shift continues until the next cutting position under the chainsaw 15 is reached. Then, for the next cut, the rotary tongs 11 are closed again and the linear tongs 9 are opened so far that the linear tongs can be moved horizontally relative to the bundle of rods or logs held. The linear pliers 9 can then again be moved to the left up to the pliers stand 7. This position is shown in Fig. 5.

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Patent Office [0055] All drives used can be designed electrically or hydraulically in both exemplary embodiments. If the device is designed to be mobile, either mounted on a self-propelled vehicle, on a trailer, in a container or as an attachment for a loader, it makes sense to use hydraulic drives, since there is not a corresponding electrical connection at every location. In this case, linearly displaceable components, but also the upper jaw part or the upper jaw parts, are moved via hydraulic cylinders. The rotary motor and the saw drive are designed as hydraulic motors. A hydraulic pump provided for generating pressure can be driven by an internal combustion engine.

If, on the other hand, it is a stationary device, it can be assumed that a high-voltage connection can be made available. In this case, the drives can be realized by electric motors and by electrical actuators.

It also applies to both exemplary embodiments that the rotation of the rotating pliers can be carried out as a continuous rotation or as a kind of rocking movement, in which the bundle of rods is rotated back and forth by almost 360 °. In the first case, special connections to the respective power source must be provided for the rotating drives.

For example, the hydraulic fluid for a hydraulically driven upper part of the rotary tongs can be guided through a pressure line, which is arranged in a hollow motor shaft and rotates with it. On the turnstile 20, the line can be routed outwards and passed on from the rotating ring 5 to the rotating lower part of the pliers. The connection between the pressure line inside the motor shaft and the hydraulic pump can be made via a rotary seal.

In the case of an electric pliers drive for the rotary pliers 11, the voltage can be transmitted to the turnstile 20 and the rotary ring 5 via a sliding contact. From there, the voltage can be passed on to the gun drive via a cable.

Whether a circular saw or a chainsaw is used is not dependent on the exemplary embodiments shown. Of course, a chainsaw can also be used in the first exemplary embodiment shown in FIGS. 1 to 2 and a circular saw in the second exemplary embodiment shown in FIGS. 3 to 8.

According to the invention, of course, a device can also be constructed which works with only a pair of pliers, but which uses a sawing device which can only be moved in the vertical direction. In this case, the single pliers must be rotatable and horizontally movable. For this purpose, the connecting rods 13 from the first exemplary embodiment could, for example, be designed as push rods 8 as in the second exemplary embodiment.

It is also possible according to the invention to work with pliers that can only be moved horizontally. In this case, a sawing device rotating around the bundle of logs or logs must be used. This sawing device must then also have a type of scraper that prevents cut pieces of logs or logs from remaining on the top of the bundle of logs or logs.

Furthermore, an embodiment is possible in which pliers are used that are neither linearly displaceable nor rotatable. In this case, all necessary movements must then be carried out by the sawing device. In this exemplary embodiment, the sawing device must therefore rotate around the bundle of rods or logs 22, must be displaceable along the longitudinal central axis of the pliers and must either be linearly displaceable or pivotable in a plane which is spanned perpendicular to the longitudinal central axis.

It goes without saying that the device according to the invention can not only be used for already bundled logs or logs. Of course, it can also be loose

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Pole or logs are used and layered in the device. The logs or logs are then combined into a bundle only by the holding device or the holding devices during the actual sawing process.

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LIST OF REFERENCE NUMBERS:

baseplate

engine stand

Engine mounting strut

rotary engine

rotating ring

roller bearing

stand for pliers

pushrods

linear pliers

Wheel

rotary tongs

rotating disk

connecting rods

saw guide

saw

Sword with chain movable upper part of the pliers fixed lower part of the pliers

irons hinge

turnstile

motor axis

Bundle of logs or logs

linear guide

Linear guide posts

circular saw blade

circular drive

pivoting lever

Rotary actuator

Longitudinal central axis

Claims (10)

Expectations 1. Device for cutting bundled wood to length with at least one device for holding (11; 9) a bundle (22) and a device for sawing (15; 25, 26) the bundle (22), characterized in that the at least one device for holding (11) and / or the device for sawing (15; 25, 26) rotatable about the longitudinal central axis (29) of the at least one device for holding (11; 9) are arranged. 2. Device according to claim 1, characterized in that the device for sawing comprises a chain saw (15) with a saw chain and guide for the saw chain. 3. Device according to one of claims 1 to 2, characterized in that the device for sawing is dimensioned such that the length of the saw cut is less than the maximum diameter of the bundle (22). 4. Device according to one of claims 1 to 3, characterized in that the at least one device for holding (11; 9) and the device for sawing (15; 25, 26) relative to one another in the direction of the longitudinal central axis (29) of the at least one Device for holding (11; 9) are displaceable. 5. Device according to one of claims 1 to 4, characterized in that the at least one device for holding (11; 9) and the device for sawing (15; 25, 26) on an axis perpendicular to the longitudinal central axis (29) of the at least means for holding (11; 9) are movable towards and away from each other relative to each other. 6. Device according to one of claims 1 to 4, characterized in that the device for sawing (15; 25, 26) is pivotally mounted in a plane which is perpendicular to the longitudinal central axis (29) of the at least one device for holding (11; 9 ) is spanned. 7. Device according to one of claims 1 to 6, characterized in that the at least one device for holding (11; 9) comprises pliers (17, 18). 8. Device according to one of claims 1 to 7, characterized in that the at least one device for holding (11; 9) and the device for sawing (15; 25, 26) can be driven hydraulically or electrically. 9. Device according to one of claims 1 to 8, characterized in that a further device for holding (9) is provided with a further pair of pliers, the two devices for holding (11; 9) having the same longitudinal central axis (29) the two pliers can be operated independently of one another and the distance between the pliers along the longitudinal central axis (29) can be changed. 10. The device according to claim 9, characterized in that one of the devices for holding (11) is rotatable and the other device for holding (9) along the longitudinal central axis (29) is arranged displaceably.