FI109185B - Blade saw system with double axle - Google Patents

Description

2,109,185 At 100 m / min and 225 mm high, the feed rate is only 40 m / min. Feed rate is limited by e.g. blade heating due to friction between the sawn timber and blades and the carbide pieces and blades on the blade guides. The blade guides reduce the lateral vibration of the blades of a circular saw with a single blade shaft, but as the cutting height increases, the effect of the blade guides decreases. As a result of this oscillation, the dimensional accuracy of the saw decreases, and to compensate it is necessary to lower the feed rate.

In a circular saw with a single blade axis, a blade diameter of about 700 mm can be used, for example, in a phase II cutting saw 10 with a blade thickness of about 2.8 mm, whereby the width of the sawing slot is about 4 mm. Such a blade can be used to cut 225 mm high plain.

From the Applicant's FI patent 100778 there is known a circular saw with a single blade axis 15 and an adjustable blade guide above the cutting surface. The lumber is sawed with one or more parallel floating circular saw blades. In this solution, each blade is supported on its periphery by a blade guide located above the sawing surface, which blade guide is height adjustable, whereby the distance between the blade guide and the feed plane of the sawn timber is adjustable.

20 j * 'Another solution uses two blade shafts, one located above the top surface of the sawn timber and the other located below the bottom surface of the sawn timber »« ·. Several parallel rotary blades are mounted on each blade shaft.

• ♦ ... The blade shafts are normally mounted obliquely on top of each other so that the vertical planes drawn at the center of the blade shafts are horizontally spaced. Each top blade forms a pair with the bottom blade in the same vertical plane.

The horizontal plane drawn at the lowest point on the outer periphery of the upper blades is slightly lower than the horizontal plane drawn on the outer periphery of the lower blades.

The sawn timber is thus sawn from the upper surface with blades above and from the underside, ···. With 30 sided blades.

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Double-axis circular saws use similar blades on both the top and bottom blade shafts. The upper and lower blades have the same diameter, the same thickness, the teeth have the same dimensions and shape, and the blades are sharpened and replaced at the same time. The upper and lower blades forming the pair 5 are always intended to be kept exactly in the same vertical plane, so that the cutting edges are aligned. However, the branches and other hard points in the sawn timber cause the blades above and below to live slightly differently, so that the cutting gaps between the top and bottom blades do not usually coincide. In the case of circular saws 10 with a single axis, the lateral vibration of the blades mentioned above naturally also occurs in circular saws with a double axis. The uneven quality of the sawing surface is one of the major problems with circular sawing machines with a double blade shaft.

For circular saws with dual shafts, the first teeth of solid wood saw blades in the feed direction of the sawn timber are subjected to the greatest strain in the blade area where the sawing takes place along the length of the sawn timber. As a result, the first saw blades dull faster due to warming than the saw blades below. The larger the diameter of solid wood saw blades, the longer the lawn area and its immediate surroundings become.

20: "Double-axis circular saws do not normally use blade guides and ;; · · each blade is fixedly flanged on the blade shaft, which results in poor arc sawing properties. · · · · · · · · · · · · · · · · · · · · on saws with circular saws, whereby the high bending resistance of the blades impairs the •: ·.

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In conventional double-axis circular saws, the blades above and below !. I 30 combined cutting path, ie the distance the blades travel is longer than a circular saw with a single axis. In addition, due to the poor cutting angle of the lawn area, the first saw blade to be cut into a solid wood will have a higher sawing resistance than the blade coming later. These factors result in a higher power consumption in a double axis circular saw than in a single axis circular saw.

The feed speed of a double-axis circular saw does not depend as much on the height of the saw-timber as on circular saws with a single-blade shaft, because the sawing is usually split evenly between two blades.

For circular saws with double shafts, for example, a blade diameter of about 500 mm can be used with a blade thickness of about 3.6 mm, whereby the width of the cutting slot is about 105 mm.

WO 98/02286 discloses a circular saw with a double blade shaft in which the top and bottom blade axes are obliquely superimposed. Here, both above and below blades are abnormally supported by fixed blade guides relative to the height of the circular saw body-15. This publication focuses on a special spindle through which floating blades are mounted on the shaft. The mandrel has a cross-section consisting of three symmetrical projections. The profile of the end regions of the projections follows the arc of a circle centered on the axis of rotation of the mandrel. The spindle further has tensile regions, the profile of which follows a curve of a circle whose center 20 is in the opposite projection.

The object of the invention is to provide a conventional circular saw with a double blade shaft.

The main features of the circular sawing apparatus according to the invention, which are provided with a double blade shaft, are apparent from the characterizing part of claim 1.

• ♦ * ·, *: *. In a circular saw with a double blade shaft according to the invention, the blades first located in the feed direction of the sawn timber are relatively small in diameter! t 30 whereas the saw blades in the feed direction of the sawn timber have a relatively large diameter such that the ratio of said diameters is in the range 0.1-0.7, ', preferably 0.3-0.5.

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The first blades in the feed direction serve as auxiliary blades and it is sought to keep the depth of their cutting gap small so that the depth of the auxiliary blades in relation to the height of the sawn timber is in the range 0.1-0.5, preferably 5 in the range 0.2-0.3.

The small diameter auxiliary blades, which are first in the feed direction, open up the blades to the blades below so that the subsequent blades do not have to be sawed in the lawn area and in its immediate vicinity. Also, the dimensional accuracy 10 is improved when subsequent blades in the feed direction can rest on this cutting gap.

Auxiliary blades extend the interval between larger diameter blades since larger blades do not have to be sawed in or around the lawn. The smaller blades that are the first to be sawed will naturally wear in the lawn area where they will cut lengthwise sawn timber. Due to the small diameter of the blades, the area of the blades also remains small, which contributes to the wear of the blades. Furthermore, the depth of the blade's cutting gap is small, whereby the resistance of the blades is also small and thus the wear of the blades is reduced. In a conventional double-blade circular saw, the first blades in the feed direction cut 20 deep into a solid wood and have a larger diameter, which results in greater wear than that of our invention.

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Preferably, the diameters of the blades below in the feed direction are selected so large that the saw blade half extends over the entire height of the sawn timber. By using such a large blade diameter in the feed direction in the blades below, the blades that are to be sawed below have the advantageous cutting angles and their cutting; ': *; the sixth path in sawn timber is short. Then also smaller and larger; :: The total cutting path of the blades becomes shorter than that of a traditional double-blade circular saw, where the blades are the same size and the saw is evenly divided. <· 30 for blades below. Thus, the power requirement of the circular saw according to the invention is less than i. '(In the above-mentioned conventional double-blade circular saw.

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Further, the blades in the feed direction below are preferably provided with blade guides, whereby the blades are floating on the blade axis. Then, in the feed direction below, the following blades also follow the saw-groove groove formed by the blades, which are very helpful in arc cutting.

To the present knowledge, the most preferred embodiment of the invention is achieved when the blade axis above the cutting surface is located first in relation to the blade axis below the saw blade, whereby the blades on the upper blade axis 10 serve as auxiliary blades. In this case, the lower edge of the blades preferably has fixed blade guides in the vertical direction below the feed plane X-X. Such a solution can be implemented such that the blade axis of the upper blades is fixed in the height direction. The upper blades are then only used for cutting high timber, and the low blades are only sawed with the lower large blades. By tracking the top blade shaft 15 for height adjustment, the top blades can be used as auxiliary blades at all heights of timber.

The blade shaft above the cutting surface may also be located in the feed direction of the sawn timber in relation to the blade shaft below, whereby the blades on the blade shaft 20 below serve as auxiliary blades. In this case, there are fixed or adjustable blade guides in the front of the blades above the top of the sawn timber.

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In both cases, the direction of rotation of the upper blades is preferably such that the front edge of the blade is cut from the upper surface of the sawn timber towards the lower surface of the sawn timber. The direction of rotation of the lower blades is respectively • •. ·, In which cases it is preferably such that the front edge of the blade is directed from the underside of the sawn timber to the upper surface of the sawn timber. With such rotational directions, the blade guides remain very clean when the chewing jet is not directed »» I.! 30 jams. By using such feed-forward cutting direction, the rotation speed of the blades <* 'T can also be increased relative to the counter-feed cutting direction without overheating the blades. The cutting resistance of the blades is lower in feed-forward cutting.

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In the double-axis circular saw of the invention, larger blades can be used similar to the conventional single-axis circular saw. Larger blades then have a diameter of, for example, about 700 mm and a thickness of about 2.8 mm, whereby the width of the sawing slot is about 4 mm. Smaller blades can be used, for example, having a diameter of about 200 mm and the same thickness as larger blades, i.e. about 2.8 mm. The width of the sawing slot is thus about 1 mm narrower than that of a conventional double-axis circular saw, which reduces the amount of wood to be sawn and generates economic savings.

10

In a circular saw with a double axis according to the invention, smaller blades with a thickness of less than 2.8 mm can also be used as smaller blades, whereby the smaller blades have a cutting gap width of less than 4 mm. With such an arrangement, the final cutting surface is formed solely by the larger blades.

15

In the circular saw according to the invention, higher feed rates can be used than in a conventional double-axis circular saw, where the upper and lower blades are equal and the saw is equally distributed on each blade in a situation where both solutions use blades that produce the same width.

With the double-axis circular saw of the invention, feed rates can be used which, depending on the height of the sawn timber, are in the range of about · ·: · 100-200 m / min without overheating the blades.

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The double-axis circular sawing apparatus according to the invention can be used. 25 for both Phase I and Phase II sawing.

The invention will now be described with reference to the figures in the accompanying drawings, in which:. : ·, Some preferred apparatuses according to the invention are disclosed, the details of which are described in the following. however, it is not intended to be solely limiting.

Fig. 1 is a diagrammatic side view of a circular saw '* *' apparatus according to the invention.

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Figure 2 shows a modification of the circular saw apparatus of Figure 1.

Figure 3 is a schematic top view of the circular saw apparatus of Figure 2.

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Figure 4 schematically shows a preferred height adjustable blade guide alignment.

The sawing apparatus 10 shown in Figure 1 is, to the present state of knowledge, the most preferred embodiment of the invention 10. The sawing apparatus 10 has the lower 12, 13 and upper 14, 15 feeders for feeding the timber 11 through the saw unit 10. The feeders 12, 13 below the sawn timber 11 form a substantially horizontal feed plane X-X of the sawn timber 11, on which the lower surface 11a of the timber 11 rests as the timber 11 moves through the sawing apparatus 10. The sawing apparatus 10 further comprises two parallel blade shafts 21, 31, the first 21 located above the upper surface 11b of the sawn timber 11 and the second 31 located below the feed plane X-X. A plurality of parallel circular saw blades 20 are mounted on the upper blade shaft 21 and a plurality of parallel rotary saw blades 30 are mounted on a lower blade shaft 31. Each of the upper blades 20 forms a pair 20 with a lower blade 30 in the same vertical plane.

The blades 20 mounted on the upper blade shaft 21 of the sawn timber 11 are located in the wood supply direction S before the blades 30 mounted on the lower blade shaft 31.

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The vertical plane Y30 drawn at the center of the lower blade shaft 31 is thus at a distance S from the vertical plane Y20 drawn to the center of the upper blade shaft 21 in the feed direction S of the lumber 11. The blades mounted on the upper blade shaft 21; The diameter D20 is smaller than that of the blades 30 * * ·, mounted on the lower blade shaft 31. diameter D30. The upper blades 21 serve here as auxiliary blades for machining slits on the upper surface of the sawn timber 11, which facilitate the cutting of the lower blades 30 »M 30 in and around their area.

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Each lower blade 30 is supported on the frame structures of the sawing device 10 by means of height-adjustable fixed blade guides 33 located below the feed plane X-X at the forward edge of the blade 30 relative to the feed direction S of the sawn timber. The upper blades 20 may not need blade guides due to the small blade diameter D20 5 of the upper blades. However, in the upper blades 20, height-adjustable or adjustable blade guides 23 located at the front edge of the blade 20 with respect to the feed direction S of the sawn timber 11 may be used. The rotation directions P20 of the upper blades 20 are clockwise so that the front edge of the blades 20 is directed from the upper surface 11b of the sawn timber 11 towards the lower surface 11a of the sawn timber 11. The rotation directions P30 of the lower blades 30 10 are counterclockwise, with the leading edge of the blades 30 facing the lower surface 11a of the sawn timber 11 towards the upper surface 11b of the sawn timber 11. In these directions of rotation, the chewing jet released by the blades from the wood is not directed to the blade guides 23, 33, whereby the blade guides 23, 33 remain clean. Also, due to the rotation direction P30 of the lower blades 30, the carbide pieces 15 of the blade guides 33 are not subjected to the same lateral forces as if the rotational directions P30 of the lower blades 30 were clockwise, since the sawing that the blades overheat.

20 The circular sawing apparatus shown in Fig. 1 may be constructed, for example, so that an existing circular saw with a single axis below the cutting surface is provided with a · · ·; • on the second saw blade feed axis, located first on the saw blade • · · ·: ·, where the auxiliary blades are mounted.

In the apparatus of Fig. 1, the feed plane X-X and the blade axles 21, 31 of the sawn timber 11 are fixed in height. With the height of the sawn timber 11 being low, the overhead auxiliary blades 20 do not participate in the sawing at all, whereby the sawing occurs only with the blades 30 below.

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•: at low heights for a normal single-blade circular saw and for sawn timber 11 at higher heights for a double-blade circular saw. In this case, the upper blades 20 will benefit from the specified height of the sawn timber from · · ·. ···. The upper blade shaft 21 can also be made height-adjustable 10 109185 so that the upper blade 20 can be operated at all heights of the sawn timber 11. Such height adjustment can be accomplished by conventional solutions known to those skilled in the art, e.g. by attaching the upper blade shaft 21 at its ends to mechanical or automatic height adjustable equipment. In its simplest form, mechanical height adjustment can be effected, for example, by means of two sockets which are inserted into the holes by tear-offs. For example, a hydraulic cylinder-piston solution can be used for automatic adjustment.

Figure 2 shows a modification of the circular saw apparatus of Figure 1. The lower blades 10 20 'are located first in the feed direction S of the sawn timber 11, whereby the lower blades 20' serve as auxiliary blades and have a diameter D'20 smaller than the diameter D'30 of the upper blades 30 'below in the feed direction S of the sawn timber. The vertical plane Y'30 drawn at the center of the upper blade axis 3Γ is thus at a distance from the vertical plane Y'20 drawn to the center of the lower blade shaft 15 21 'in the feed direction S of the sawn timber 11. In the upper blades 30 ', fixed or adjustable blade guides 33' may be used. The height adjustable blade guides 33 'can adjust the distance h between the feed plane X-X of the sawn timber 11 and the blade guide 33' so that the distance between the upper surface 11b of the sawn timber 11 and the blade guide 33 'remains constant from the height h 20 of the sawn timber. The directions of rotation P'30 of the upper blades 30 'are clockwise, with the leading edge of the blades 30' facing the upper surface 11b of the sawn timber 11 towards the lower surface 11a of the sawn timber 11 '. The lower blades 20 'rotate in a counterclockwise direction P'20, with the leading edge of the blades 20' facing from the lower surface 11a of the sawn timber 11 towards the upper surface 1 Ib of the sawn timber 11 '.

In these directions of rotation, the blade guides 23 ', 33' remain clean.

In the embodiment shown in Fig. 2, advantageous cutting angles of larger blades 30 'are utilized in the vertical direction at a fixed feed plane XX than:>:: in the embodiment shown in Fig. 1, in particular regardless of height h. The depth h2 of the auxiliary blades 21 'with respect to the height h of the sawn timber 11 in this embodiment depends on the height h of the sawn timber 11 at a fixed height X-X at a fixed feed level. Of course, the position X-X is height adjustable.

In both the embodiments of Figure 1 and Figure 2, the diameter ratio D 20 / D 30 of the smaller blades 20, 20 'and the larger blades 30, 30'; D'20 / D'30 is in the range 0.1-0.7, preferably 0.3-0.5. The depth h2 of the sawing gap for smaller blades 20, 20 'with respect to the height h of the sawn timber 11 is in the range 0.1-0.5, preferably 0.2-0.3. The diameter D 30) D 30 of the larger blades 30, 30 'is chosen such that the saw blade half-10 which cuts the timber 11 extends over the entire height h of the timber 11 to be sawn.

Figure 3 is a schematic top view of the sawing apparatus 10 of Figure 2. The figure shows the guiding means 16, 17, the upper blade shaft 3Γ, the upper blades 30 'and the blade guides 33' necessary for laterally guiding the saw timber 11 Ti-T2.

Figure 4 illustrates a preferred height-adjustable blade guide alignment showing a blade 30 'above the circular saw apparatus 10 shown in Figure 2 and a blade guide 33'. The upper blades 30 'are attached at their center 32' to the body R 20 of the sawing device 10 via the blade shaft 31 '. The center 32 'of the blade 30' may move in the longitudinal direction of the blade axis 31 ', i.e. with respect to the feed direction S of the timber 11, in the direction tT2 of the saw unit 10. For example, the center 32 'of the blade 30' has a groove pattern on the circumference of the circle> I I ·: ·. a gingerbread pattern or the like formed from successive curved surfaces and a corresponding pattern on the blade shaft 31 '. With such an arrangement, the center 32 'of the blade 30' can: * · *: 25 move in the direction of the blade axis 31 'but is locked in the rotation direction P'30 of the blade shaft 31', i.e. slip of the rotation P'30 is eliminated.

::: Each blade 30 'is supported on its outer circumference by a blade guide 33' above the cutting surface.

The attachment point 34 'of the blade guide 33' above the cutting surface may be moved around the circumference R'30 of the outer circumference of the blade 30 'drawn on the center of the blade 30 30' between the blade guide 33 'and the feed plane X-X. · · ·, The distance h can be adjusted.

Further, the arrangement may be implemented such that the longitudinal central axis A of the blade guide drawn at the attachment point 34 'of the blade guide 33' remains parallel to the radius R'3 mentioned in the adjustment. When the longitudinal central axis A of the blade guide 33 'remains parallel to the radius R'3 during adjustment 5, the carbide nozzles 35' continuously guide the side surfaces of the outer circumference of the blade guide 33 'at a constant distance from the center of the blade 30'.

With the above arrangements, the distance of the blade guide 33 'from the upper surface 11b of the sawn timber 10 11 can be kept constant regardless of the height h of the sawn timber.

The blade guide 33 'is secured by suitable fastening means, e.g. with a bolt and nut, to a device containing groove 36' in or on the body R of the sawing apparatus 10, which follows the arc of said radius R'3. The blade guide 33 'further comprises a guide member 37', whereby the longitudinal central axis A of the blade guide 33 'is displaced parallel to said radius R'3.

The adjustment of the distance Y between the upper blade guides 33 'and the feed plane X-X of the sawn timber 11 may be simulated to be performed manually or automatically.

20 In automatic adjustment, for example, the hydraulic lever can be used to move the blade guide 33 '. raul and / or stepper motor. The positioning of the blade guide 33 'in the desired position can then take place, for example, from the positioning path obtained from the guide means 14 above the timber 11; , dolla. For the automatic control of the blade guide 33 ', the values measured from wood, ...: 11, may also be used.

The adjustment arrangement of the blade guides shown in Fig. 4 can of course also be applied to the blade guides 23 of the auxiliary blades 20 in the case of Fig. 1 if the height adjustable blade guides are to be used in the auxiliary blades 20:.

Both the smaller blades 20, 20 'and the larger 30, 30' blades may consist of single or multi-sector blades. Blades 30, 30 'with larger diameter D30, D'30, which normally use blade guides 33, 33' have floating blades and blades 20, 20 'with smaller diameter D20, D'20, which do not normally use blade guides the blades are flanged at their center and fixed to the blade shaft 21, 2Γ.

In the circular sawing apparatus according to the invention, a second blade guide (not shown in the figures) which is located in relation to the first blade guide 33, 33 'of the larger diameter blades 30, 30' may also be used in connection with larger diameter blades 30, 30 '. on the opposite side.

The sawing unit 10 further comprises a drive motor for the blade shafts 21, 2F, 31, 31 'and one or more drive motors for the transmission and guide means 12, 13, 14, 15, 16, 17 of the log 11. or other similar bet.

The claims which follow, within the scope of which the inventive concept is defined, may vary from those set forth above by way of example only.

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Claims 1. A circular sawing apparatus (10) with a double shaft comprising feeders (12, 13) forming a feed plane (XX) below the sawn timber (11), feeders (14, 15) above the sawn timber (11), lateral (TrT2) guiding means (16, 17) for the sawn timber (11) and the lower blade shaft (21, 31 ') above the upper surface (11b) of the sawn timber (11) and below the feed plane (XX), wherein each circular saw blade (20, 30 ') 10 mounted on the upper blade shaft (21, 3') forms a pair with the same vertical plane as the circular saw blade (20 ', 30) mounted on the lower blade shaft (2, 31'), characterized in in the feed direction (S) of the circular saw blades (20, 20 ') first in the direction (S) and in the feed direction (S) of the sawn timber (11) diameter ratio of circular saw blades (30, 30 ') (D20 / D30; D'20 / D'30) is in the range of 0.1-0.7, preferably 0.3-0.5, 15 and that the smaller blades (20, 20 ') of the first blades (20, 20') located first in the feed direction (S) of the timber to be sawn the depth (h2) relative to the height (h) of the sawn timber (11) is in the range 0.1-0.5, preferably 0.2-0.3, whereby the remainder (h-h2) of the height (h) of the sawn timber (11) sawing the sawn timber (11) in the feed direction (S) with the larger blades (30, 30 ') located below.

Apparatus according to claim 1, characterized in that the diameter (D30, D'30) of the larger blades (30, 30 ') below in the feed direction (S) of the sawn timber (11) is selected such that the saw blade half extends to the saw | over the entire height (h) of the timber (11).

; ·. Apparatus according to one of claims 1 to 2, characterized in that the direction of rotation (P'20, P30) of the blades (20 ', 30) mounted on the lower blade shaft (21', 31) is as follows; Wherein the cutting edge of the blade (20 ', 30) is oriented from the lower surface of the sawn timber (11) towards the upper surface (11b) of the sawn timber (11).

Device according to one of Claims 1 to 3, characterized in that the direction of rotation (P20, P'30) of the blades (20, 30 ') mounted on the upper blade shaft (21, 3') is such that

Claims (9)

A double-blade blade saw (10) comprising underneath the timber (11) to be said lying feeder (12, 13) forming a feed plane (XX) for the timber 5 (11) to be sawn, over the timber (11) which should be saw lying feeder devices (14, 15), devices (16, 17) for controlling the timber (11) to be cut sideways (TrT2) and an Upper bait shaft (21, 3Γ) located above the upper surface (lib) of the wood (11) to be said and a lower bait shaft (2Γ, 31) which lies below the feeder plane (XX), whereby on the upper bait shaft (21, 3Γ) mounted blade edge bite (20, 30 ') forms a pair 10 with a blade egg bite (20 ', 30) mounted in the same vertical plane on the lower bait shaft (2Γ, 31), characterized in that the ratio (D20 / D30; D'20 / D'30) between the diameter of the blade egg bites (20, 20') ) which is first in the feed direction (S) of the wood (11) to be said and the diameter of the blade egg bites (30, 30 ') which are later in the feed direction none (S) for the wood (11) to be said is in the range 0.1-0.7, advantageous in the range 0.3-0.5 and the depth (h2) of the sawing crack of the smaller bites (20, 20 ') located first in the feed direction (S) of the wood (11) to be said in relation to the height (h) of the wood (11) to be said is in the range 0.1-0.5, advantageously in the range 0.2 -0.3, wherein the remaining portion (h-h2) of the height (h) of the timber (11) to be said is said with the larger bites (30, 30 ') which lie later in the feed direction (5) of the timber (11). ) to be said. 20. Installation according to claim 1, characterized in that the diameter (D30, D'30) of the l * *. - the larger bites (30, 30 ') which lie later in the feed direction (S) of the wood (11) to be shelled; ·, Is said to be chosen in such a way that the half of the wood that says the timber extends over the whole .. ,,: the height (h) of the timber (11) to be said. 25 Installation according to any one of claims 1-2, characterized in that the direction of rotation (P'20, P30) of the beds (20 ', 30) mounted on the lower bait shaft (2', 30) is: , that the cutting with the leading edge of the bite (20 ', 30) is directed from the lower::: the surface (1a) of the wood (11) to be said against the upper surface (1bb) of the wood (11) which : 30 should be said. 1 * 1 * »• '. _ Installation according to any of claims 1-3, characterized in that the direction of rotation (P20, P'30) of the beds (20, 30 ') mounted on the upper bait shaft (21,31') ') is the saying, 109185, that the saying with the leading edge of the bite (20, 30') is directed from the upper surface (11a) of the wood (11) to be cut against the lower surface (lib) of the wood (11) as should be told. Plant according to any one of claims 1-4, characterized in that the bait shaft (21) which lies above the upper surface (lib) of the wood (11) to be sawn lies first in the feed direction (S) of the wood (11) which The saw (20) with the smaller diameter (D20) lies on the Upper bead (21) and the bite (30) with the larger diameter (D30) lies on the lower bead (31). 10 System according to claim 5, characterized in that the bite (30) with the larger diameter (D30) mounted on the lower bait shaft (31) is supported against the frame structures of the sawing plant (10) with a height fixed below the feeder plane ( XX) lying bite control device (33). 15 Plant according to claim 6, characterized in that the lower bite guide device (33) lies at the leading edge of the lower bite (30) in relation to the feed direction (S) for the wood (11) to be cut. Plant according to any of claims 5-7, characterized in that the upper bite; the shaft (21) is vertically adjustable. Plant according to any of claims 1-4, characterized in that the bait shaft (2Γ): which lies below the feeder plane (X-X) lies first in the feed direction (S) of the wood (11), ·. The bait (20 ') with the smaller diameter (D'20) lies on the lower bite axis (2Γ) and the bite (30') with the larger diameter (D'30) lies on the upper bite axis. (31 '). ; Installation according to Claim 9, characterized in that the bite (3Γ) mounted bite (30 ') with the larger diameter (D'30) on the upper bite (· 30) is supported against the body structure. .: the tions of the sawing plant (10) having a vertical height fixed over the upper surface (1 lb) of the wood (11) to be said lying bite control device (33 '). * »·> · 109185 11. A plant according to claim 9, characterized in that the bite (30 ') mounted bite (30') with the larger diameter (D'30) mounted on the upper bait shaft (30 ') is supported against the frame structures of the saw plant with a height adjustable over the upper the surface (1 lb) of the timber (11) to be said lying bite guide device (33 '), the distance (h) between the upper bite guide device (33') and the feeder plane (XX) of the timber (11) to be said is adjustable . 12. An installation according to claim 9, characterized in that the attachment point (34 ') for each upper bite control device (33') is adjustable along the bend of a circular radius (R'3) drawn to the middle point of the upper bite (30 ') and larger. than the radius (R'30) of the outer circle of the bite (30 '). Device according to claim 12, characterized in that a longitudinal center axis (A) of said bite guide device (33 ') drawn to the point of attachment (34') of the upper bite guide device (33 ') is inclined in the direction of said circular radius (R'3). ) in the regulation. Plant according to any one of claims 10-13, characterized in that each upper bite control device (33 ') lies at the front canyon of the upper bite (30') in relation to the feed direction (S) of the wood (11) to be said . 20! I »i 109185 LO -— X - ____ D Ό ^ CT CD, o - \ J'k v-cl r \ ^ o“ -> D ^ o ^ ~ / 0 / ΝΧ \? (! Λ4-} ".,. ΓΜ V: W— <e An ° 7 J> r J T; s n, 1 '*. ! rt |> · I ~; T: XH