CA1256351A - Tree-trunk sawing and cutting installation - Google Patents
Tree-trunk sawing and cutting installationInfo
- Publication number
- CA1256351A CA1256351A CA000498562A CA498562A CA1256351A CA 1256351 A CA1256351 A CA 1256351A CA 000498562 A CA000498562 A CA 000498562A CA 498562 A CA498562 A CA 498562A CA 1256351 A CA1256351 A CA 1256351A
- Authority
- CA
- Canada
- Prior art keywords
- hollow shaft
- shaft
- knife head
- saw blade
- saw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
Abstract Sawing and cutting apparatus for logs includes at least one knife head which serves as a cutting tool for the production of wood chips. At least one saw blade axially spaced from the knife head is connected to a saw shaft and, is axially displace-able and serves for cutting at least one sideboard. The knife head is connected to a hollow shaft the saw shaft being coaxially rotatable and axially displaceable in the hollow shaft. The saw shaft is connected to a drive apparatus which provides a higher rotational speed than the hollow shaft. A second circular saw blade is attached on the front side of the knife head facing the first circular saw blade.
Description
WO 8~/05062 Our Ref: 014150-021 Sawing and Cutting Apparatus for Logs The invention relates to a sawing and cu-tting apparatus for logs, with at least one knife head which serves as a cutting tool for the production of wood chips and at least one circular sawblade connected with a saw shaft arranged coaxially and spaced thereto which serves -to saw off at least one sideboard.
In the processing of round -timber logs to lumber such as boards and square timber, it is known from tha so-called profile-cutting method how to cut the exterior wood parts which would give slabs with knife heads to wood chips suitable, for example, for the production of chipboard or cellulose.
In a known apparatus of the initially described type (DE-OS 29 47 190), two opposite-lying knife heads and several intermediate-lying circular saw blades are arranged on a common shaft. The difficulty with this, howe~er, is that the knife heads have to be driven at a relatively low rotational speed to produce wood chips of suff'icient fiber length, whereas a suf'ficiently high rotational speed is required for driving the circular sawblade with respect to the required sawing quality. Both requirements can no-t be fulfilled simultaneously with the known apparatus, so that in general a too high rotational speed of the knife heads and with it an insufficien-t quality of the wood chips produced has to be put up wi-th.
~ .
Furthermore, in the known apparatus the circular sawblades are arranged rigidly on the common drive shaft so that only boards or square timber of constant width can be produced. An adjust-ment to different desired dimensions is not possible or only through an expensive reconstruction of the apparatus.
It has already been known for a long time (DE-OS 20 10 o60) how to carry out the sawing process for the production of the side-board or sideboards simultaneously, but independent of the cutting process. In the known apparatus, belt saws or gang saws are used which also make possible an adjustment of the width. The feed rate of the logs must be chosen relatively low in this case, however, to accomodate the requirements of the sawblades, which in turn is disadvantageous for the cutting process.
The relatively high feed rate of the logs possible with the cutting -tools for wood chip produc-tion, which is desirable for reasons of high work capacity, makes it necessary to carry out the sawing-off of the sideboard or sideboards, respectively, with rapidly running circular saws which are usually spaced at greater distances to the cutting tools in the feed direc-tion of the logs, for example, double circular saws in pairs on -top of each other, or displaced with respect to one another. In this arrangement, with a high feed rate, the rota-tional speeds of the knife heads and circular sawblades can be optimally chosen in each instance wi-th a high feed rate of the logs, but the spatial separation of the knife heads and the circular sawblades causes unavoidable imprecisions, especially for the -thickness of the sideboard to be sawed off. Only with expensive _ ~ _ ~2~
guide measures can i-t be assured that the surface of the sideboard sawed by the circular sawblades is sufficiently parallel to the plane surface produced beforehand by the knife head (DE-OS 29 18 622).
It is therefore the object of the inven-tion -to design a sawing and cutting apparatus of the initially described type in such a way that an adjustment to varying thicknesses of the sideboard to be sawed off is made possible at optimal speeds of the knife head and the circular sawblade in a straightforward manner.
This object is attained according to the invention by connecting the knife head with a hollow shaft, supporting the saw shaft rotatably and axially displaceable in the hollow shaft and connecting the saw shaft with a drive apparatus which delivers a higher rota-tional speed than the hollow shaft.
With the separa-te drive of the saw shaft with higher rota-tional speeds than the hollow shaft of the knife head, the respective optimal rotational speeds can be chosen for each of the two separate working processes, so that on the one hand wood chips with sufficiently large fiber length are produced at a high feed rate of the logs, and on the other hand a high work quality of the saw cutting is achieved. Because the cutting process which also delivers the outer plane surface is carried out simultaneously with the sawing process and in close spatial proximity thereto, it is assured that the two lateral faces of the sideboard produced in in this way and the thickness of the sideboard remain constant.
'~256~
These conditions remain the same when -the circular sawblades are adjusted -to change the thickness of the sideboard which is made possible in a very simple way by axial displacement of the saw shaft in the hollow shaft.
If the application field of the apparatus according to the invention was stated before as the processing of logs, the processing of round timber logs on two opposite sides is to be understood hereunder, and also the processing of modules which were already flattened on two sides and then processed on sides lying opposite to one ano-ther.
It is known however (DE-PS 21 ~8 912) how to attach a knife head to a hollow shaft for profile cutting of the lateral face of a log in which a faster running saw shaft is supported which carries a circular saw-blade. Herein, however, the circular sawblade is situated in the front side of the knlfe head and does not serve to saw off a side-board, but only to smooth the surface produced by the knife head.
An axial displacement of the circular sawblade is not provided for and would not make sense here.
Axially displaceable circular saws arranged on coaxial hollow shafts are known in di~ferent embodiments (US-PS 3 630 2L~L~). These known apparatus only serve for the transverse adjus-tment of the circular sawblades, however; they do no-t have knife heads as cutting tools.
The thus adjustable circular sawblades are driven by a common drive at the same rotational speed.
5'~
In a further development of the inven~ion, it is provided that the flight diameter of the circular sawblade is at most two times the wood chip length smaller than the flight diameter of the closest-lying cutting edges of the knife head. In this ~7ay, it is accomplished that at the end of a log the cutting process of the knife head is finished before the sawing process is finished.
In order to achieve a simple and especially compact construction, it is advantageously provided that the hollow shaft and the saw shaft are connected with a common drive motor via two gear trains with different transmission ratios.
It is known,however, (DE-A-33 12 033, Fig. 13) how to arrange an axially displaceable, separately driven circular saw blade with axial spacing in front of a knife head. The saw shaft which carries this circular saw blade is not however supported in the hollow shat connected with the knife head and is not coa~ial to it, but rather it is supported in a rigid bearing body lying in the interior of the hollow shaft, whereby the bearing of the saw shaft lies eccentrically to the hollow shaft carrying the knife head.
This known apparatus is of relatively complicated make, because on the one hand a bearing of the hollow shaft carrying the knife head on the rigid bearing body and on the other hand a bearing of the saw shaft carrying the circular sawblade in this rigid bearing body are required.
Also, the circular sawblade which is frontally attached to the knife head is missing in this known device. The sa~ed-off sideboard does not show a sawed surface on lts exterior but rather a surface produced by the knife head which can have fissures and the like.
On the front side of the knife head facing the circular sawblade another circular sawblade can be attached which smooths the outer surface of the sideboard in a way known per se r and avoids roughness and flssures from the cutting process.
To process opposite sides of a log one knlfe head can be provided on each side of the log which has an axially adjustable circular sawblade. In order to make possible a quick and simple adjustment to different dimensions of the log, a sled carrying the bearing of the hollow shaft can be guided in a machine frame and adjusted transversely with respect to the transportation direction .
~,.
-8a-The invention is explained in more detail with respect to an em-bodiment shown in the drawing.
Fig. 1 shows a sawing and cutting apparatus for logs in a partial cross-section, and Fig. 2 is a lateral view in the direction of the arrow II in Fig. 1.
The sawing and cutting apparatus shown in the drawing serves in -the embodiment shown to process the opposite sides of a module 1, the upper side and under side of which have already been flattened.
The module 1 which is designa-ted in general in the following as a log is guided by a feed and transportation apparatus of which only a transportation roller 2 is shown in Fig. 2 over a support 3. On both sides of the support 3, a knife head 4 equipped with chopping knives is arranged which serves to cut up the lateral parts la of the log 1 into wood chips.
The knife head 4 is attached to a hollow shaft 5 which is pivoted in a sled 7 with bearings 6. The sled 7 is displaceably guided on guideways 8 transversely to the transportation direction of the log 1.
In the hollow shaft 5 of the knife head 4 a saw shaft 10 is pivo-ted and axially displaceably supported on bearings 9. The saw shaft 10 carries a circular sawblade 11 on its free end which serves to saw off a sideboard lb from the log 1. On the front side facing the circular sawblade 11 a further circular sawblade 12 is attached on the knife head 4 which serves to smoo-th the outer surface of the side-board lb.
_ 9 _ At the end of the hollow shaft 5 a belt pulley 13 is attached which is connected over a belt drive 14 wi-th a bslt pulley 15 on the output shaft of a drive motor 16 which is supported by the sled 7.
A belt pulley 17 with a diameter which is smaller than that of the belt pulley 13 is pivoted at the back end of the hollow shaft 5 with a bearing 18 and forms a drive connection with the saw shaft 1 over an adjusting spring 9, whereby howsver an axial relative move-ment is possible. The belt pulley 17 is connected with a belt pulley 21 on the output shaft of the drive motor 16 over a belt drive 20. The diameter of the belt pulley 21 is larger than that of the belt pulley 15.
With the described choice of diameters of the belt pulleys 13,15,17 and 21, it is accomplished that the saw shaft 10 is driven at a higher rotational speed than the hollow shaft 5 by the common drive motor 16. The saw shaft 10 receives a relatively high speed required for an optimal sawing process of the circular sawblade 11, whereas the knife head L~ is driven with the relatively low rotational speed which is optimal for the production of wood chips.
The drive and -the adjustment of the circular sawblade lL~ on the opposite side of the log 1 and of the knife head 4 is carried out in the same manner as described; the apparatus used herefor which was built in the manner described was therefore left out of Fig. 1.
In the embodiment shown, the flight diameter of the circular saw-blade 11 is approximately equal to the flight diameter of the knife head 4 or the circular sawblade 12 attached to i-t, respectively.
;3~
On the right hand side of the log 1 it is shown on the circular sawblade 11 that its flight diameter can also be chosen smaller than the assigned knife head 4, so tha-t the circular sawblade 11 still cuts when the knife head 4 or the attached circular saw-blade, respectively, is already out o~ engagement wi-th the wood.
In the processing of round -timber logs to lumber such as boards and square timber, it is known from tha so-called profile-cutting method how to cut the exterior wood parts which would give slabs with knife heads to wood chips suitable, for example, for the production of chipboard or cellulose.
In a known apparatus of the initially described type (DE-OS 29 47 190), two opposite-lying knife heads and several intermediate-lying circular saw blades are arranged on a common shaft. The difficulty with this, howe~er, is that the knife heads have to be driven at a relatively low rotational speed to produce wood chips of suff'icient fiber length, whereas a suf'ficiently high rotational speed is required for driving the circular sawblade with respect to the required sawing quality. Both requirements can no-t be fulfilled simultaneously with the known apparatus, so that in general a too high rotational speed of the knife heads and with it an insufficien-t quality of the wood chips produced has to be put up wi-th.
~ .
Furthermore, in the known apparatus the circular sawblades are arranged rigidly on the common drive shaft so that only boards or square timber of constant width can be produced. An adjust-ment to different desired dimensions is not possible or only through an expensive reconstruction of the apparatus.
It has already been known for a long time (DE-OS 20 10 o60) how to carry out the sawing process for the production of the side-board or sideboards simultaneously, but independent of the cutting process. In the known apparatus, belt saws or gang saws are used which also make possible an adjustment of the width. The feed rate of the logs must be chosen relatively low in this case, however, to accomodate the requirements of the sawblades, which in turn is disadvantageous for the cutting process.
The relatively high feed rate of the logs possible with the cutting -tools for wood chip produc-tion, which is desirable for reasons of high work capacity, makes it necessary to carry out the sawing-off of the sideboard or sideboards, respectively, with rapidly running circular saws which are usually spaced at greater distances to the cutting tools in the feed direc-tion of the logs, for example, double circular saws in pairs on -top of each other, or displaced with respect to one another. In this arrangement, with a high feed rate, the rota-tional speeds of the knife heads and circular sawblades can be optimally chosen in each instance wi-th a high feed rate of the logs, but the spatial separation of the knife heads and the circular sawblades causes unavoidable imprecisions, especially for the -thickness of the sideboard to be sawed off. Only with expensive _ ~ _ ~2~
guide measures can i-t be assured that the surface of the sideboard sawed by the circular sawblades is sufficiently parallel to the plane surface produced beforehand by the knife head (DE-OS 29 18 622).
It is therefore the object of the inven-tion -to design a sawing and cutting apparatus of the initially described type in such a way that an adjustment to varying thicknesses of the sideboard to be sawed off is made possible at optimal speeds of the knife head and the circular sawblade in a straightforward manner.
This object is attained according to the invention by connecting the knife head with a hollow shaft, supporting the saw shaft rotatably and axially displaceable in the hollow shaft and connecting the saw shaft with a drive apparatus which delivers a higher rota-tional speed than the hollow shaft.
With the separa-te drive of the saw shaft with higher rota-tional speeds than the hollow shaft of the knife head, the respective optimal rotational speeds can be chosen for each of the two separate working processes, so that on the one hand wood chips with sufficiently large fiber length are produced at a high feed rate of the logs, and on the other hand a high work quality of the saw cutting is achieved. Because the cutting process which also delivers the outer plane surface is carried out simultaneously with the sawing process and in close spatial proximity thereto, it is assured that the two lateral faces of the sideboard produced in in this way and the thickness of the sideboard remain constant.
'~256~
These conditions remain the same when -the circular sawblades are adjusted -to change the thickness of the sideboard which is made possible in a very simple way by axial displacement of the saw shaft in the hollow shaft.
If the application field of the apparatus according to the invention was stated before as the processing of logs, the processing of round timber logs on two opposite sides is to be understood hereunder, and also the processing of modules which were already flattened on two sides and then processed on sides lying opposite to one ano-ther.
It is known however (DE-PS 21 ~8 912) how to attach a knife head to a hollow shaft for profile cutting of the lateral face of a log in which a faster running saw shaft is supported which carries a circular saw-blade. Herein, however, the circular sawblade is situated in the front side of the knlfe head and does not serve to saw off a side-board, but only to smooth the surface produced by the knife head.
An axial displacement of the circular sawblade is not provided for and would not make sense here.
Axially displaceable circular saws arranged on coaxial hollow shafts are known in di~ferent embodiments (US-PS 3 630 2L~L~). These known apparatus only serve for the transverse adjus-tment of the circular sawblades, however; they do no-t have knife heads as cutting tools.
The thus adjustable circular sawblades are driven by a common drive at the same rotational speed.
5'~
In a further development of the inven~ion, it is provided that the flight diameter of the circular sawblade is at most two times the wood chip length smaller than the flight diameter of the closest-lying cutting edges of the knife head. In this ~7ay, it is accomplished that at the end of a log the cutting process of the knife head is finished before the sawing process is finished.
In order to achieve a simple and especially compact construction, it is advantageously provided that the hollow shaft and the saw shaft are connected with a common drive motor via two gear trains with different transmission ratios.
It is known,however, (DE-A-33 12 033, Fig. 13) how to arrange an axially displaceable, separately driven circular saw blade with axial spacing in front of a knife head. The saw shaft which carries this circular saw blade is not however supported in the hollow shat connected with the knife head and is not coa~ial to it, but rather it is supported in a rigid bearing body lying in the interior of the hollow shaft, whereby the bearing of the saw shaft lies eccentrically to the hollow shaft carrying the knife head.
This known apparatus is of relatively complicated make, because on the one hand a bearing of the hollow shaft carrying the knife head on the rigid bearing body and on the other hand a bearing of the saw shaft carrying the circular sawblade in this rigid bearing body are required.
Also, the circular sawblade which is frontally attached to the knife head is missing in this known device. The sa~ed-off sideboard does not show a sawed surface on lts exterior but rather a surface produced by the knife head which can have fissures and the like.
On the front side of the knife head facing the circular sawblade another circular sawblade can be attached which smooths the outer surface of the sideboard in a way known per se r and avoids roughness and flssures from the cutting process.
To process opposite sides of a log one knlfe head can be provided on each side of the log which has an axially adjustable circular sawblade. In order to make possible a quick and simple adjustment to different dimensions of the log, a sled carrying the bearing of the hollow shaft can be guided in a machine frame and adjusted transversely with respect to the transportation direction .
~,.
-8a-The invention is explained in more detail with respect to an em-bodiment shown in the drawing.
Fig. 1 shows a sawing and cutting apparatus for logs in a partial cross-section, and Fig. 2 is a lateral view in the direction of the arrow II in Fig. 1.
The sawing and cutting apparatus shown in the drawing serves in -the embodiment shown to process the opposite sides of a module 1, the upper side and under side of which have already been flattened.
The module 1 which is designa-ted in general in the following as a log is guided by a feed and transportation apparatus of which only a transportation roller 2 is shown in Fig. 2 over a support 3. On both sides of the support 3, a knife head 4 equipped with chopping knives is arranged which serves to cut up the lateral parts la of the log 1 into wood chips.
The knife head 4 is attached to a hollow shaft 5 which is pivoted in a sled 7 with bearings 6. The sled 7 is displaceably guided on guideways 8 transversely to the transportation direction of the log 1.
In the hollow shaft 5 of the knife head 4 a saw shaft 10 is pivo-ted and axially displaceably supported on bearings 9. The saw shaft 10 carries a circular sawblade 11 on its free end which serves to saw off a sideboard lb from the log 1. On the front side facing the circular sawblade 11 a further circular sawblade 12 is attached on the knife head 4 which serves to smoo-th the outer surface of the side-board lb.
_ 9 _ At the end of the hollow shaft 5 a belt pulley 13 is attached which is connected over a belt drive 14 wi-th a bslt pulley 15 on the output shaft of a drive motor 16 which is supported by the sled 7.
A belt pulley 17 with a diameter which is smaller than that of the belt pulley 13 is pivoted at the back end of the hollow shaft 5 with a bearing 18 and forms a drive connection with the saw shaft 1 over an adjusting spring 9, whereby howsver an axial relative move-ment is possible. The belt pulley 17 is connected with a belt pulley 21 on the output shaft of the drive motor 16 over a belt drive 20. The diameter of the belt pulley 21 is larger than that of the belt pulley 15.
With the described choice of diameters of the belt pulleys 13,15,17 and 21, it is accomplished that the saw shaft 10 is driven at a higher rotational speed than the hollow shaft 5 by the common drive motor 16. The saw shaft 10 receives a relatively high speed required for an optimal sawing process of the circular sawblade 11, whereas the knife head L~ is driven with the relatively low rotational speed which is optimal for the production of wood chips.
The drive and -the adjustment of the circular sawblade lL~ on the opposite side of the log 1 and of the knife head 4 is carried out in the same manner as described; the apparatus used herefor which was built in the manner described was therefore left out of Fig. 1.
In the embodiment shown, the flight diameter of the circular saw-blade 11 is approximately equal to the flight diameter of the knife head 4 or the circular sawblade 12 attached to i-t, respectively.
;3~
On the right hand side of the log 1 it is shown on the circular sawblade 11 that its flight diameter can also be chosen smaller than the assigned knife head 4, so tha-t the circular sawblade 11 still cuts when the knife head 4 or the attached circular saw-blade, respectively, is already out o~ engagement wi-th the wood.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Sawing and cutting apparatus for logs with at least one knife head which serves as a cutting tool for the production of wood chips and at least one saw blade which is axially spaced from it, is connected to a saw shaft, is axially displaceable and serves for cutting at least one sideboard, and in which the knife head is connected with a hollow shaft, characterized in that the saw shaft is coaxially rotatable and axially displaceable in the hollow shaft carrying the knife head, that the saw shaft is connected with a drive apparatus which provides a higher rotational speed than the hollow shaft and that a second circular saw blade is attached on the front side of the knife head facing the first circular saw blade.
2. Sawing and cutting apparatus according to Claim 1, characterized in that the flight diameter of the circular saw blade is at most two times the wood chip length smaller than the flight diameter of the cutting edge of the knife head that is closest to the circular saw blade.
3. Sawing and cutting apparatus according to Claim 1, characterized in that the hollow shaft and the saw shaft are connected with a common driving motor by way of two gear trains with different transmission ratios.
4. Sawing and cutting apparatus according to Claim 1, characterized in that for working opposite sides of a log a knife head with an axially displaceable circular saw blade is provided on each side of the log.
5. Sawing and cutting apparatus according to Claim 1, characterized in that a sled supporting the bearing of the hollow shaft is guided in the frame of the machine and can be displaced transversely to the direction of transportation of the logs.
6. An apparatus for the cutting and sawing of logs, said apparatus comprising:
a hollow shaft mounted for rotation about its longitudinal axis, a knife head carried by said hollow shaft and including a first circular saw blade for the production of wood chips from logs, a saw shaft extending coaxially through said hollow shaft and rotatable about its longitudinal axis relative to said hollow shaft, and linearly displaceable along its longitudinal axis relative to said hollow shaft, means for linearly displacing said saw shaft along its longitudinal axis, a second circular saw blade carried by said saw shaft so as to be axially spaced from said first circular saw blade for the production of sideboards from the logs, and drive means for rotating said hollow shaft and for rotating said saw shaft at a faster speed than said hollow shaft so that said second circular saw blade rotates faster than said first circular saw blade.
a hollow shaft mounted for rotation about its longitudinal axis, a knife head carried by said hollow shaft and including a first circular saw blade for the production of wood chips from logs, a saw shaft extending coaxially through said hollow shaft and rotatable about its longitudinal axis relative to said hollow shaft, and linearly displaceable along its longitudinal axis relative to said hollow shaft, means for linearly displacing said saw shaft along its longitudinal axis, a second circular saw blade carried by said saw shaft so as to be axially spaced from said first circular saw blade for the production of sideboards from the logs, and drive means for rotating said hollow shaft and for rotating said saw shaft at a faster speed than said hollow shaft so that said second circular saw blade rotates faster than said first circular saw blade.
7. Apparatus according to claim 6, wherein said drive means comprises a drive motor and first and second drive transmitting means connecting said motor with said hollow shaft and said saw shaft, respectively, said first and second drive transmitting means defining different transmission ratios to rotate said saw shaft faster than said hollow shaft.
8. Apparatus according to claim 6, including log support means, said hollow shaft, knife head, saw shaft, second circular saw blade and drive means disposed on one side of said log support means, and further comprising an additional said hollow shaft, and additional said knife head, and additional said saw shaft, and additional said second circular saw blade, and an additional drive means disposed on the other side of said log support means.
9. Apparatus according to claim 6 including a carriage upon which said hollow shaft is rotatably mounted by means of bearings, said carriage together with said hollow shaft, being moveable in the direction of said longitudinal axis of said hollow shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000498562A CA1256351A (en) | 1985-12-24 | 1985-12-24 | Tree-trunk sawing and cutting installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000498562A CA1256351A (en) | 1985-12-24 | 1985-12-24 | Tree-trunk sawing and cutting installation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1256351A true CA1256351A (en) | 1989-06-27 |
Family
ID=4132173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000498562A Expired CA1256351A (en) | 1985-12-24 | 1985-12-24 | Tree-trunk sawing and cutting installation |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1256351A (en) |
-
1985
- 1985-12-24 CA CA000498562A patent/CA1256351A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1132883A (en) | Process and device for the chipping dissection of tree trunks into all-round machined wooden products | |
| US4416312A (en) | Guiding mechanism for timber cutting machines | |
| EP1137519B1 (en) | Method and apparatus for scoring and sawing | |
| US4691749A (en) | Tree-trunk sawing and cutting installation | |
| US4015648A (en) | Sawmill | |
| CA2177745A1 (en) | Compact Small Diameter Log Sawmill | |
| US4711279A (en) | Device for shaving the sides of tree trunks | |
| US7743802B2 (en) | Edge trimming and board ripping apparatus and method | |
| EP0294997A3 (en) | Method and apparatus for sawing logs | |
| CA2374201A1 (en) | Sawdust-free wood cutting method and apparatus | |
| CA1256351A (en) | Tree-trunk sawing and cutting installation | |
| US4793390A (en) | Headrig slabbing head | |
| US4674185A (en) | Planer attachment for chain saws | |
| CA2193794A1 (en) | Thin kerf circular gangsaw | |
| CA1245134A (en) | Device for shaving the sides of tree trunks | |
| CA1136966A (en) | Method and chip-manufacturing edging-mill for edging board | |
| CN214644363U (en) | Band sawing machine with multiple saw wheels | |
| SU1586905A1 (en) | Cutting mechanism of circular sawing machine | |
| CN211967766U (en) | High-speed reciprocating cross cutting saw | |
| CA2277559A1 (en) | Cutter head for a combined wood edger and chipper | |
| RU2013200C1 (en) | Combined wood-working machine tool | |
| CN219616818U (en) | Pipe cutting machine convenient to adjust | |
| RU2038953C1 (en) | Machine tool for the longitudinal sawing of logs | |
| RU2127187C1 (en) | Method of formation of plasty on log and device for its realization | |
| AU4126896A (en) | Sawing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |