JPH0424205B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a veneer lace that cuts a wide thin veneer veneer using a cutting blade that spans the entire length of the raw wood while holding and rotating the left and right end faces of the raw wood, and particularly relates to the commercial value of plywood products. In addition to making it possible to increase the yield of high-quality veneers that are used on the front and back sides of plywood, which affects the quality of the wood, it also provides a veneer lace that is ideal for cutting weak logs and low-grade logs with cracks.

In recent years, plywood manufacturing factories have begun to use lower-quality raw wood logs due to the deterioration of the raw wood situation, or due to efforts to maintain manufacturing costs by reducing the cost of raw wood, which accounts for the majority of plywood manufacturing costs.

On the other hand, in order to improve raw material yield and work efficiency, there is a need to use veneer lace to cut low-quality logs into high-quality veneers at high speed and down to a small diameter. is also getting stronger.

For this reason, recently we have been working to address these issues,
Emphasis has been placed on the research and development of a veneer lace in which rotational driving force is supplied from the outer circumference of the log by pressing a drive roller with a large number of blades on the outer circumference of the attached log.

However, with such peripheral drive type veneer lace, scratches and cracks are likely to occur due to the peripheral drive of the raw wood, and the area is squeezed by the pressure bar and wood chips accumulate on the top, which occasionally passes through the pressure bar. At that time, there was a risk that the surface of the veneer veneer would be damaged or the pressing force of the pressure bar would be made uneven, thereby degrading the quality of the veneer veneer. For example, recent veneer laces that make frequent use of rotating rolls with protrusions, as shown in Figure 1, are now on the market and have achieved some success in efficient cutting of veneer veneers, but on the other hand, the above-mentioned problems continue to occur. ing. That is, a plane stand 1 equipped with a cutting blade 2, and a single plate guide surface 3 on the back of the cutting blade 2.
A pressure bar body 5 is disposed above the planer stand 1, and a guide member 4 having a
The veneer lace has a structure in which a pressure bar 6 pressurizes the vicinity of the cutting edge of the cutting tool of the raw wood 11, and a serrated rotating body 8 that pierces the outer peripheral surface of the raw wood 11 to rotate the raw wood. Serrated rotating body 8
have sharp protrusions 9 on their outer circumferential surfaces, and a plurality of them are mounted at regular intervals in the axial direction on a rotating shaft 10 installed on the pressure bar body 5 parallel to the cutting edge of the cutter 2. On the other hand, the pressure bar 6 is arranged so as to press the outer peripheral surface of the log 11 between the sawtooth rotating bodies 8. In such a recent device, the log 11 is rotated in the direction of arrow A, while the planer stand 1 and the pressure bar body 5 are integrally rotated by a feed screw (not shown) to rotate the log once. On the other hand, the wood is advanced by a predetermined thickness of the veneer, and a veneer veneer of a predetermined thickness is cut out using the cutter 2 and the pressure bar 6. This cut veneer 7 is pierced by the pierced bodies 9 of the saw-toothed rotary body 8, and the log 11 is rotated according to the rotational drive of the rotary body 8, and while the veneer 7 is cut, the pierced bodies 9 are pierced. The veneer will be transported backwards while attaching the board. In this type of veneer lace, the serrated rotating body 8 contacts the log 11 at the top of the cutting tool 2 and rotates the log, so as the diameter of the log 11 becomes smaller as the cutting progresses, As the outer circumferential curvature of the log 11 became large, the serrated rotating body 8 could not penetrate the log 11 sufficiently, and the veneer could not be cut smoothly. Therefore, as a solution, in order for the rotary body 8 to sufficiently pierce the log even if the log 11 becomes thinner, the piercing body 9 should be set quite deep from the beginning of cutting the log, that is, the serrated rotor 8 should be placed deep into the log. 11 had to be strongly pressurized. Therefore, the raw wood is bent due to the strong piercing pressure of the rotating body, and the piercing marks of the piercing body 9 on the raw wood remain vividly and are not removed, and furthermore, the cut veneer 7 is Since it is transported while being stuck by the piercing body 9 of the sawtooth rotating body 8,
In the raw wood state, the pierced body 9 continues to be stuck and progresses to the veneer 7, and the veneer 7 is transported rearward with the pierced body 9 stuck to the surface thereof. As a result, the surface of the veneer 7 has many puncture marks that are quite deep and remain as large defects, and these punctures further develop into numerous cracks and fissures, which have a serious negative impact on the quality of the veneer. It was. In particular, when cutting and transporting extremely weak veneers cut from brittle punky logs or thin veneers of 1 mm or less, many tears occur due to the above reasons, making it difficult to continuously cut and transport high-quality veneers. It was so severely damaged that it could no longer be used for the front and back veneers, which determine the commercial value of plywood products, and the yield was reduced. Furthermore, in front of the cutting edge of the veneer lace, a sharp circular saw-shaped rotating body (corresponding to the height of the worker) constantly rotates at high speed, and due to the function of the veneer lace, it is impossible to hide this part. The situation is extremely dangerous 24/7. Furthermore, the serrated rotating body is subject to severe wear and tear, and its functionality is drastically reduced in about 10 days during normal work, and it is necessary to replace it with a new one each time. The running costs as a product are also enormous. The present invention was made for the purpose of improving the above-mentioned defects, and its main purpose is to provide a veneer lace that can safely cut veneer smoothly in a wide range of materials, from brittle raw wood to hard wood, at low maintenance cost.

In order to solve the above problems in the present invention,
We have carefully reexamined the literature and materials related to various cutting machines and wood cutting that have been published to date. As a result, there may be some deformation, but when cutting a veneer as a veneer race, a so-called pressure member that applies pressure near the cutting edge of the cutting tool is an essential element. They realized that there are two types of roller bars (driving type and driven type), and that both have conflicting interests and disadvantages, and that they are insufficient to solve the problem. Specifically, the fixed pressure nose bar can be easily installed at the predetermined position according to the cutting conditions at the cutting edge. This part bears most of the cutting resistance and appears as a large load resistance, resulting in a number of problems such as destruction of the cutting log. On the other hand, the cutting resistance of the rotating roller bar is very small, and by driving the roller, the cutting resistance can be significantly reduced. However, the fate of a roller bar with a circular cross section is that an unforeseen situation arises at the position where pressure is applied to the log, which is determined at a certain ratio according to the thickness of the cut veneer.

When cutting veneer with veneer lace, the position is approximately 20% of the thickness of the cut veneer in the opposite direction to the direction of rotation of the raw material from the tip of the cutting tool (correctly, in Figure 2, the tip of the cutting tool and the fixed pressure bar 6 It is said that it is best to apply pressure by the distance perpendicular to the tip of the roller bar, and as the diameter of the roller bar becomes larger, it becomes impossible to satisfy the above condition. In other words, as the outer periphery of the large-diameter rotating roller bar approaches the predetermined pressurizing position of the raw wood, the lower outer periphery of the roller bar tends to come into contact with the back surface (rake surface) of the cutting blade, and the predetermined pressure increases. Before reaching the position, it comes into contact with the back side of the cutter, making it impossible to apply pressure to the specified position. The above conditions become more severe as the thickness of the cut veneer becomes thinner, and as part of a breakthrough, it is necessary to reduce the diameter of the roller bar. Naturally, the thinner the roller bar (a roller bar with a diameter of about 16 mm is used in the United States), the higher its rotational speed becomes, which increases the load on the bearings. problems are induced. Also,
If there is a slip between the outer periphery of the log and the roller bar, the rotational drive device for the roller bar will also be large, which is disadvantageous.

Based on the above-mentioned circumstances, it is common knowledge that roller bars are not suitable for cutting thin veneers of around 1.2 mm in Japan, even if they are suitable for cutting rough veneers of around 2.5 mm that are cut in the United States. and
In fact, no roller bars are used in Japanese plywood factories. Compared to a fixed pressure nose bar, cutting resistance can be significantly reduced.
It also has the potential to eliminate jammed blades at the cutting edge, making it an advantage that is difficult to throw away. Therefore, as a step, we repeated the test by arranging the fixed pressure nose bar and the rotating roller bar alternately in half, but the results showed that the fixed type pressure nose bar and the rotating roller bar were arranged alternately in half, and the result was that the fixed type pressure nose bar and the rotating roller bar were arranged alternately. Due to the difference in the pressurizing effect between the pressure nose bar and the rotating roller bar, the thickness was over and under in various places, and there was no way it could have been a veneer product. The above is just one example, but the present invention focuses on the advantages of both the above-mentioned, and as a compensation for repeated research and development, it brings out only the advantages of the fixed pressure nose bar and the rotary roller bar, and each It has been completed by making up for the shortcomings of.

In order to achieve this objective, the present invention has a planer stand that has a cutting tool and is installed so that it can move forward and backward toward the raw wood, and a pressure bar that is installed parallel to the cutting tool and is integrated with the planer stand so that it can move forward and backward. In a known veneer race equipped with a suspended pressure bar body, a roller disk with a flat outer circumferential surface is equipped with a pressure buffer mechanism and is driven to rotate at a circumferential speed faster than the outer circumferential speed of the log to be cut. It is characterized by being installed on a pressure bar body.

An embodiment will be described below with reference to the drawings.

FIG. 2 is a side sectional view showing one embodiment of the present invention, and FIG. 3 is a front view. In the figure, log 11 is rotated in the direction of arrow A while its left and right end surfaces are held between them. Further, the plane stand 1 and the pressure bar body 5 are assembled vertically and are integrally held at their left and right end surfaces, and are configured to rapidly approach or separate from the raw wood 11 by, for example, a feed screw (not shown). When cutting veneer veneer, log 11
For each revolution of , it moves forward toward the raw wood by a predetermined thickness of the cut veneer. Reference numeral 1 in FIG. 2 denotes a planer stand, which has a substantially triangular cross section, and a cutter 2 is tightly held by a blade holder 2' on the side of the planer stand 1 facing the raw wood 11 with the cutting edge facing upward. A base 4 made of a material such as stainless steel is attached to the surface of the planer stand 1 that comes into contact with the cutter 2. At the top of this base 4, there is a veneer P cut from raw wood 11.
Arc-shaped or inclined veneer guide surface 3 that serves as a passageway for
is formed. Reference numeral 4' denotes an auxiliary base which is disposed adjacent to the lower side of the base 4 in the direction of carrying out the veneer, and similarly to the base 4, has a veneer guide surface 3' formed on its top. Note that this auxiliary cap may be constructed integrally with the cap 4, but this part suffers a lot of wear and tear, so it is more advantageous in terms of maintenance and the like to arrange it separately from the cap 4. Further, the guide surfaces 3, 3' at the top of the mouthpieces 4, 4' are formed in an arc shape similar to the outer circumferential circle of the roller disc 8, which will be described later, with the starting end near a position slightly retreated from the cutting edge of the cutter 2, or It is formed as an inclined surface or the like that gradually approaches the lower outer circumferential surface of the vertical center line of the roller disk. Furthermore, the base 4,
4' is constructed as a single piece that spans the entire width of the planer stand 1 (in the length direction of the log 11), or it can be made into multiple pieces or divided into pieces by appropriately cutting out the middle part in the width direction of the planer stand of the bases 4 and 4'. Arrange as multiple pieces of type. In another embodiment, rollers or the like are arranged on the guide surface of the die to increase the smoothness of conveyance of the veneer. In addition, when cutting veneer from relatively high-quality logs, it is not necessary to consider the top of the veneer as a guide surface for the veneer.
It may be configured to have a simple linear slope from the vicinity of the tip of the blade to the back slope of the planer stand 1, which becomes the veneer transport path. On the other hand, a pressure bar body 5 is mounted above the planer stand 1, and as described above, the pressure bar body 5 is mounted above the planer stand 1.
At the same time, the left and right end surfaces are held together and the log 1
It is configured to be able to advance and retreat relative to 1. The side of the pressure bar body 5 facing the raw wood is an inclined surface 5', and this inclined surface 5' has a narrow slope as shown in FIG. A plurality of type pressure bars 6 are arranged. In addition, this inclined pressure bar 6
The whole or a plurality of them may be formed into an integral piece, and the portions corresponding to the gaps between the divided fixed pressure bars 6 shown in FIG. 3 may be cut out as appropriate.

A height adjustment mechanism 6' (partially not shown) is disposed approximately at the midpoint of the inclined surface 5' of the pressure bar body. An adjustment screw 6'' is inserted through this adjustment mechanism 6', and its lower end is connected to the fixed pressure bar 6. By adjusting this part, the log 11 of the lower end of the pressure bar 6 is connected.
The pressure can be increased or decreased by raising or lowering the position of the pressure. The pressure applied to the raw wood by the fixed pressure bar 6 prevents the tip from cracking when cutting the veneer veneer, correctly regulates the thickness of the veneer, and effectively prepares the peeling surface of the veneer. The cut veneer protrusion formed by the tip of the blade 2 is called the blade mouth.

A rotation shaft 10 is mounted on the pressure bar body 5 in parallel with the cutter 2 near the cutter mouth.
A plurality of thin disk-shaped roller disks 8 each having a flat outer circumferential surface are connected to the rotating shaft 10 in a skewer-like manner. As shown in FIG. 3, the roller disks 8 are arranged between the divided fixed pressure bars 6, or in the notches of the fixed pressure bar when they are constructed as one piece. However, in addition to being arranged evenly over the entire width of the pressure bar body 5 (in the length direction of the log 11), the intermediate part or both ends may be omitted as appropriate. Furthermore, the scoring knives (which determine the width of the cut veneer) are sometimes placed closely together. This rotating shaft 10 is usually configured as a spline shaft as shown in FIG. It is rotated in the direction of arrow B by a drive mechanism including a tension device (not shown) and a tension device. FIG. 4 is a side sectional view of the vicinity of the cutting edge and the pressure bar body, and is a detailed view of the pressure buffering mechanism of the roller disk and the advancing/retracting mechanism, which are the main parts of the present invention. For example, the bearings 21 that support the rotating shaft 10 are held at multiple locations in the axial direction by needle bearings, etc., and the multiple bearings 21 are held and connected together by connecting portions 21' arranged parallel to the axial direction. ing.
Further, the lower surface of the connecting portion 21' is fused to a sliding surface 21'' to which a wear-resistant clad plate is affixed, making it possible to slide in the direction of arrow C. 22 denotes the connecting portion 2.
This screw shaft is attached to the rear part of the shaft 1' and extends slightly rearward, and is usually located near the left and right end sides of the connecting portion, which are arranged parallel to the axis.
Reference numeral 23 denotes a female screw that is threadedly engaged with the screw shaft and extends rearward (toward the right in FIG. 4). It is connected to a worm wheel 25 that fits on the outer peripheral surface. Worm wheel 25
The worm box 27 is held in a predetermined position by thrust bearings in the front and rear of its axial direction, and by a bush 28 in its radial direction.
26 is a worm which meshes with the worm wheel 25, and both are housed in a predetermined position in the worm box 27. The worm box 27 is attached to the internal mounting surface 12 of the inner pocket of the pressure bar body 5 configured in a tubular shape.
The axis of the pressurizing shock absorbing mechanism, which extends perpendicularly to the axis of the rotating shaft 10, is accurately attached to the axis of the rotating shaft 10 through appropriate tension plates. The worm 26 has a protruding shaft end (not shown), and is connected to a pulse motor or other electric motor by mounting a chain wheel or the like on this part to drive the electric motor in forward and reverse rotation by a predetermined amount (not shown). With the arrow D), the worm wheel 25,
The screw shaft 22 is moved in the direction of arrow C via the key 24 and the female screw 23. Note that the rotation command and amount of rotation of the worm 26 are determined in advance by a movement limiting element such as a limit switch or a micro switch operated by the outer periphery of the rotary joint 31, which will be described later, and a movement limiter arranged in the direction of movement of the planer stand, for example. Each time the worm 2 reaches a predetermined log diameter, the worm 2
6 is rotated by a predetermined amount and the roller disk 8 is applied an appropriate amount of pressure toward or away from the raw wood through the screw shaft 22.In addition to this automatic mechanism, it is also possible to operate the roller disc 8 manually while visually checking the raw wood cutting status. It is. In addition to the worm speed reduction mechanism using a combination of a worm and a worm wheel, it is also possible to use other gear speed reduction mechanisms or other speed reduction mechanisms. In short, it is sufficient if the small amount of movement of the roller disk can be accurately grasped and controlled. Next is the female thread 23, whose end is connected to a rotary joint 31 with a helical roller bearing, etc.
The other side of the rotary joint 31 is connected to a piston rod 3 protruding from a fluid cylinder 33.
The two tips are built-in and connected. Therefore, the female screw 23 rotates due to the rotational drive of the worm 26, but the rotary joint 3 connected to the female screw rotates.
Even if the outer periphery of the piston rod 32 rotates together with the female thread, the rotation is not transmitted to the piston rod 32, which is connected to the inner race through built-in bearings.
The range from the screw shaft 22 to the worm box 27 represents the advancing/retracting mechanism 20 for the roller disk 8.
In addition, as another embodiment, only one set of roller disk advancing and retracting mechanisms may be disposed in the intermediate portion of the connecting portion 21', or furthermore, the connecting portion 21' may be abolished.
Alternatively, it is also possible to cut the left and right edges and install roller disk advance and retreat mechanisms that operate independently or in conjunction with each other in the vicinity of the left and right bearings 21. On the other hand, the fluid cylinder 33
is mounted on the bracket 34, and is correctly fixed and installed on the back mounting surface 13 of the pressure bar body 5, which is prepared in a plane exactly perpendicular to the axis of the screw shaft 22. A pressurized shock absorbing mechanism 30 is constituted by the mating female thread 23, the rotary joint 31, and the fluid cylinder 33 disposed in series with the joint. In Figure 4, the pressure buffer mechanism has moved forward toward the log 11 side (in the figure, it has moved in the direction of arrow F on the left).
The state is illustrated. When moving backward from this state to the right, pressure fluid flows in from the cylinder head 35 side on the left side of the fluid cylinder 33 as shown in the figure, and the piston 36 moves in the direction of arrow E. Accordingly, the rotary joint 31 connected to the piston rod 32 and the female thread 23 also move to the right in the figure. In this case, the outer circumferential surface of the female thread 23 that is inscribed with the worm wheel 25 will move away from the worm wheel 25 while sliding therebetween.
The worm wheel 25 and the female thread are fitted with a sufficient length for the amount of movement of the piston 36, so that most of the worm wheel 25 remains fitted at all times. Further, it is preferable that the key between the two be a double key or a spline groove to accommodate movement in two directions of rotation and sliding.

Next, regarding the fluid pressure supplied to the fluid cylinder 33, a hydraulic system is generally used frequently. Therefore, the cylinder 33 is configured to be pressurized via a solenoid valve by operating a push button switch, for example. In addition, the fluid cylinders of the pressurizing and buffering mechanism may be arranged in the same way as the advancing/retracting mechanism of the roller disk, or may be arranged only in one central part of the roller disk, or separately on the left and right sides, regardless of the arrangement of the advancing/retracting mechanism of the roller disk. It is also possible.

In FIG. 4, the front part 5' of the pressure bar body 5 has a substantially triangular side cross section and is configured to be removable, and is adapted to cover the bearing 21, the connecting part 21', etc. on the cutting side of the raw wood. , 14
is a mounting bolt hole in the front section 5' of the pressure bar body.

In the above configuration, the embodiments and effects of the present invention will be described in detail.
has a flat outer peripheral surface, is driven at an outer peripheral speed faster than the rotational peripheral speed of the log 11, and is always in contact with the log 11 with an appropriate pressing force by the pressure buffer mechanism 30. Therefore, the pressing force of the roller disc 8 on the raw wood in a substantially horizontal direction or the horizontal direction and the rotational driving force of the roller disc in the tangential direction of the raw wood, which is faster than the outer peripheral speed of the raw wood, work in a superimposed manner.
The resultant force appears as an acting force that presses the log 11 diagonally downward, and as a result, the deflection of the log in the opposite direction when cutting a veneer with a cutting blade, which inevitably occurs when cutting a log with a veneer lace, is prevented. This exhibits a remarkable effect in preventing so-called bending, in which the central part of the log in the axial direction, which is rotated by the spindle while holding the left and right end faces of the log, separates from the cutter 2 and causes buckling. Furthermore, when cutting a veneer for veneer lace, the blade tends to bite into the raw wood, causing the raw wood to come closer to the pressure bar and increasing the frictional resistance of the fixed pressure bar. By pressurizing and rotating the outer peripheral surface of the log with a plurality of roller discs 8 at a position slightly above the log pressing position of the fixed pressure bar 6 in the rotation direction of the log, the resistance of the fixed pressure bar 6 is prevented from increasing. It can be prevented. Next, the veneer cutting mode of conventional veneer lace from raw wood with cracks is illustrated step by step in Figure 5.
It will look like D. In other words, in the cutting state of a crack R such as a water crack or a dry crack existing in the log 11, the starting end M of the crack escapes from the cutter 2 to the crack R due to cutting resistance. Furthermore, the N portion cannot withstand the sudden instantaneous cutting load and escapes away from the outer circumference of the log. This phenomenon becomes more pronounced as the sharpness of the knife 2 decreases. As a result, the N and M portions gradually develop into a lump-like shape and are left behind (the outer circumference of the log other than these parts is gradually stripped away by the knife and becomes smaller in diameter). It collides with the mouth and ends up fragmenting the log as shown in Figure D. In contrast, the roller disk 8 according to the present invention maintains a buffering effect with an appropriate pressing force on the outer circumferential surface of the log slightly above the pressing point of the fixed pressure bar 6 that presses the outer circumferential surface of the log in the rotational direction of the log, and Since it is rotationally driven at an outer peripheral speed faster than the outer peripheral speed of the raw wood 11, the roller disc works to force the starting ends N and M of the crack into the cutting edge, and the cutting of the veneer by the blade is completed without fail. That's what happens.
Naturally, the breakage of the log shown in FIG. 5D is also impossible.

These phenomena are caused by a pushing action that packs the log into the space of the cracked portion of the log at a position above the pressing point of the fixed pressure bar 6 in the rotation direction and at a speed faster than the outer peripheral speed of the log. For example, in the case of a rotating body with a piercing body, the above-mentioned peripheral speed difference cannot be obtained because it pierces the raw wood, and therefore the pushing action does not work. Next, in the case of the recent veneer lace that uses a piercing-type driving rotary body, the effect cannot be achieved at all unless the piercing body completely pierces the log. Unless a pressure-receiving rotating body mechanism or the like is installed on the opposite side of the log to receive the piercing pressure, it would not be possible to eliminate the negative effects of conventional veneer lace. Of course, in the case of extremely sharp objects such as needle-like objects, even if the force applied to the object can be reduced, it may not be suitable for transferring rotational force to the raw wood, or there may be conflicts of interest such as wear and tear on the object. It was a difficult task.

As mentioned above, the present invention was able to demonstrate its effectiveness particularly in the case of cracked logs. Furthermore, since the strong pressing force caused by the piercing pressure described above is not required, even if the log 11 becomes smaller in diameter as cutting progresses, there is no risk that the log will bend due to the pressing force, and the left and right end surfaces of the log will eventually be cut. It is now possible to reliably cut to the diameter of the spindle being gripped. In addition, when cutting raw wood (generally called castella wood) that has a part of the raw wood that is weathered and has an extremely soft part, when cutting the veneer lace of the stabbing rotary body into a wide thin veneer, the The weathered soft parts may be broken into pieces or crushed into pieces, which may cling to the cutting edge and block the cutting edge, interrupting further cutting of the veneer, or may cause foreign objects to form during the conveyance process of the cut veneer. As a result, disadvantages occur, such as causing problems in the next step. However, in the present invention,
The weathered and weak parts are also cut out in the same way as normal veneer veneers, and this is because the veneer itself is not punctured. The roller disk 8 may be moved by the roller nose bar advance/retreat mechanism 20 or the pressure buffer mechanism 30 as necessary.
It is also possible to completely separate the veneer from the outer peripheral surface of the log 11 and cut the veneer in exactly the same way as conventional veneer lace. This method is used when cutting extremely high-quality raw wood, and is used for pressure cutting of raw wood using a fixed pressure bar 6 that is split as a pressure bar or has a partially cut-out part. It was no different from the manufactured veneer veneer. Note that in cases where rapid separation is required when the roller disk is detached from the raw wood, it is convenient to use the pressure buffer mechanism 30 using fluid pressure. In addition, the outer peripheral speed of the roller disk is generally 2 to 20
It is best to rotate at a speed faster than the outer circumferential speed of the log within a range of %. In addition, when the pressurizing force of the roller disk is increased by the above-mentioned pressure buffering mechanism, the speed may be set to increase over a wide range of 1 to 25% of the circumferential speed of the log, depending on the various properties of the log.

Furthermore, after repeated various careful tests, the ratio of the total width in the axial direction of the raw wood of the fixed pressure bar 6 that presses the outer peripheral surface of the raw wood to the total width of the roller disc 8 according to the present invention is approximately
It has been found that it is best to set the ratio to around 10:1, and that there is no practical problem up to the ratio of about 7:3, and in reality, a range of 10:0.5 to 3 is good. Moreover, if radial slits or the like are formed in the thin disc-shaped roller disk 8, the above-mentioned effects are slightly increased. After all, the main part is composed of a completely simple thin disk-shaped roller disk, and even if the outer circumferential surface of the disk-shaped disk is considerably worn, as long as the wear state is average. By increasing the rotational drive speed of the roller disk, each of the above-mentioned effects can be easily achieved without reducing its functions, which is extremely economical. As mentioned above, other embodiments of the present invention include replacing the worm reducer with another speed reducer, installing the speed reducer outside the pressure bar body 5,
It is also possible to replace the fluid cylinder with a synthetic mechanism such as a spring or cam with a simple design change. The effects of the present invention can be summarized as follows.

1. Good quality veneers without puncture marks can be obtained at a high yield.

2. The yield of veneers from low-grade logs with various defects such as cracks and rot is increased.

3. There is no clogging of the blade edge of the veneer lace, improving the operating rate.

4. There are no stabbing rotating bodies, etc., ensuring safe work.

5. There are no replacement parts such as the piercing rotor. Therefore, there is no need to replace parts, making it maintenance-free.

6. The roller disc can continue to operate even if it is considerably worn, and the degree of wear is minimal, so running costs can be reduced significantly.

7. If desired, the roller disc can be retracted and used as a conventional veneer lace. Therefore, low equipment costs can be expected as multi-purpose veneer lace can be used by one person for two purposes.

As explained above, the veneer lace according to the present invention can easily solve the much-needed labor and resource savings, thereby greatly contributing to the industry.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional veneer lace, Fig. 2 is a side sectional view of an embodiment of the present invention, Fig. 3 is a partial front view, and Fig. 4 is a detailed side of the pressure buffer mechanism and advance/retreat mechanism. The sectional view, FIG. 5, is a diagram showing how a cracked log is cut using a conventional race. 1... Planer stand, 2... Blade, 2'... Blade holder, 4
...Case, 5...Pressure bar body, 6...
... Fixed pressure bar, 8 ... Roller disk, 10 ... Rotating shaft, 11 ... Raw wood, 20 ... Advance/retreat mechanism, 22 ... Screw shaft, 27 ... Warm box, 30 ... Pressure buffer mechanism, 32 ... Piston rod, 33...Fluid cylinder, 34...Bracket.

Claims (1)

[Scope of Claims] 1. A blade for cutting a veneer from raw wood, a plurality of fixed pressure bars, and a position in the gap between each of the fixed pressure bars that can contact both the raw wood whose outer periphery is to be cut and the cut veneer. a plurality of disc-shaped roller disks with flat outer circumferential surfaces arranged on the disk, a drive mechanism that rotates the roller disks at an outer circumferential speed faster than the outer circumferential speed of the raw wood, and a pressurized buffer mechanism that brings the roller disks into contact with the raw wood. A veneer lace characterized by comprising: and an advancing/retracting mechanism for moving a roller disk toward or away from logs. 2. The veneer lace according to claim 1, wherein the drive mechanism for rotating the roller disk is configured to be variable speed. 3. The veneer lace according to claim 1 or 2, wherein the pressure buffer mechanism for bringing the roller disk into contact with the raw wood is constituted by a fluid cylinder. 4 The drive mechanism of the roller disk is such that the outer circumferential speed of the roller disk is 1 to 25% of the outer circumferential speed of the log.
Any one of claims 1 to 3, characterized in that the speed can be increased within the range of
Veneer lace as described in section. 5. The advancing/retracting mechanism is equipped with a log diameter detection mechanism that detects the rotation radius of the log to be cut or the log being cut, and a control device that drives a roller disk based on a signal from the detection mechanism, and has a diameter that corresponds to the outer diameter of the log to be cut. The veneer lace according to any one of claims 1 to 4, wherein the roller disc is automatically moved toward or away from the raw wood. 6. The veneer lace according to any one of claims 1 to 5, wherein the roller disk is moved horizontally or substantially horizontally by the movement mechanism. 7. The veneer lace according to any one of claims 1 to 6, wherein the roller disk advancing and retracting mechanism is equipped with a speed reducer formed by a combination of a worm and a worm wheel. 8. Claims 1 to 8, characterized in that the ratio of the contact area between each fixed pressure bar and the log to the contact area between the roller disk and the log is approximately 10:0.5 to 3.0. The veneer lace according to any one of item 7.