JPS5920612A - Anticurl cutter for veneer in veneer lathe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a veneer lace veneer veneer curl prevention cutting device, and more specifically, the present invention relates to a veneer lace veneer veneer curl preventing cutting device. This invention relates to a device having a multi-function machine which is improved so as to prevent this during the cutting process, and the device itself for preventing the same eliminates clogging of the veneer and promotes smooth cutting delivery.

Traditionally, veneer veneers produced using veneer lace have the impression that they tend to curl, and the reality is that many workers are forced to spread out the curls while carrying out subsequent processes such as cutting and stacking. However, this is hindering the promotion of automation and labor saving.

To improve this, it is clear that the curling of the veneer lace can be corrected in advance during the so-called cutting process and the veneer can be produced as a flat veneer, which will dramatically streamline the veneer manufacturing process. In order to achieve the above-mentioned rationalization, we proposed and researched the production of a flat veneer by forcibly bending the veneer in the opposite direction to the curling direction near the rake face of the cutter to form surface cracks. However, the current situation is that it has not been put into practical use.

These basically have a protrusion of an appropriate shape formed on the rake face of the cutter, or a patch plate that essentially functions as a protrusion. As shown in Japanese Patent Publication No. 19098/1983, a single plate passage is formed between the roller coated with an elastic body and the convex portion.

Some have a front crack on the opposite side of the back crack.

In this case, since the blade is effectively pressed against the log, the blade bends, making it difficult to cut the veneer to an accurate thickness. The rollers are deformed and the veneer is fed out without bending. In addition, there is a possibility that the resistance of the part of the elastic roller that is in contact with the convex part will be greater than the resistance of the part that rotates in contact with the raw wood, and that the difference in roller radius will cause a speed difference on the surface, which may damage the elastic body and cause smooth rotation. It had serious drawbacks such as being unable to rotate and the elastic body being damaged by knives.

Another device with a different configuration is a curl prevention device for a single plate in a rotary lace (Japanese Patent Laid-Open No. 51-5
As shown in Japanese Patent No. 3699), in correspondence with the blade having the above-described structure, a backing plate for bending the veneer is provided at the lower part of the pressure bar, and comes into contact with the surface of the veneer to be cut out,
There is a device that has a path to form a front crack on the opposite side from the back crack, but since the path for bending the veneer has fixed sliding surfaces on both sides, the middle plate passing through it is in the opposite direction to the discharge direction. subject to frictional resistance in the direction. This resistance force f has a property that the larger the bending action is, the larger it acts in a substantially proportional manner. The veneer became clogged due to the banding that could not be overcome, making cutting difficult.

Conventionally known devices for preventing curling during the cutting process of veneer lace, as exemplified by the various devices mentioned above, include:
The only common problem to be solved is to bend the veneer and form a surface crack on the front side.In addition to manufacturing the veneer, which is the primary function required for veneer lace, and cutting the so-called raw wood to make the veneer, However, there was no function to smoothly feed the veneer while preventing it from curling, and it was extremely difficult to put it into practical use at this stage.

The present invention has been made based on this recognition, and an object of the present invention is to solve the various problems of conventional devices and provide a device that can be put to practical use.

Another object of the present invention is to provide a cutting device that is improved so that the device that bends the veneer convexly from the rake surface of the cutter to form surface cracks on the front side itself serves as a device for carrying out the veneer immediately after cutting. It is on offer.

Another object of the present invention is to prevent the veneer curl phenomenon during the cutting process, thereby significantly improving workability in the next process.

Next, the present invention capable of achieving the above object will be explained in detail with reference to an embodiment shown in the drawings.

The basis of the present invention is a structure in which the veneer discharge port from the raw wood surface near the cutting edge of the cutter to the rake face (lead white) of the cutter is guided and fed out by a rotating peripheral surface of a relatively large diameter. The flow of the veneer veneer passing through the discharge port is significantly smoother, which makes it extremely safe and reliable to forcibly push and bend the veneer toward the back (in the direction of the back crack) and form a front crack on the front side. There is little risk of the blade becoming jammed.

For example, in a veneer lace in which a cutting blade l is installed parallel to a pair of rotational axes that support both ends of log A and rotate them, as shown in Figure 1, at least slightly higher than the cutting edge of blade 1 or A part of one circumferential surface is positioned over the veneer discharge surface 2a (rake surface side of the cutter 1) of the white lead 2 to which the cutter l is attached from the position where the cutting edge of the cutter l is on the same line in the horizontal direction, so-called the vicinity of the cutting edge. A rotary body 3 is provided parallel to the cutter 1, and the veneer S immediately after cutting is discharged from between the cutting edge of the cutter 1 and the rotor 3 and sent out along the lower outer circumferential surface of the rotor 3. A member 4 is provided on the white lead 2, and a veneer delivery passage 5 with an appropriate gap is formed between the slope 4a of the undulating member 4 and the outer peripheral surface of the rotating body 3.

The undulating member 4 is configured to substantially become a convex portion on the single plate discharge surface of the lead white 2, creating a drop with the lead white itself, and the apex 4b thereof becomes the end of the delivery passage 5. The passage will be opened in that area. Furthermore, in order to apply a forced feeding force to the veneer S in the delivery passage 5, to carry out smooth unloading of the veneer, and to eliminate various problems such as clogging, the rotating body 3 is equipped with a drive related to the cutting speed. Mechanism B is connected.

That is, as the cutting progresses and the log A becomes the central circle, the rotating body 3 is in contact with the surface of the log, so that a rotational force is constantly applied from the surface, and the speed is the same as the cutting speed. It is possible to cut off the drive of the rotary body 3 and switch to driven mode. However, at the beginning of cutting the raw wood A, the shape is distorted, and the rotating body 3 sometimes touches the raw wood A and sometimes does not, and the speed of the rotating body 3 is at a minimum of 0 or a value close to O, and at the highest, it is cut. Even if the speed is the same, it changes greatly and creates a shock.

Therefore, it is necessary to control the circumferential speed of the log A and the circumferential speed of the rotating body 3 to be approximately equal, at least until the log A becomes a center circle. For example, as shown in FIG. 2, a DC generator 8 is connected to the shaft of a variable speed main motor 7 that rotates a rotating shaft 6 of the veneer lace,
The generated voltage El is proportional to the number of rotations of the log, and the position of the blade 1, which moves toward the center of the log A as the veneer S is cut, is proportional to the diameter of the log A. (Substantially, the lead white 2 to which the cutter 1 is attached)
For example, a variable resistor 9 that changes (in relation to the movement of the log The circuit is constructed so that the proportional voltage E2 is taken out and is faithfully proportional to the cutting speed.

This voltage E2 is applied to the variable speed electric motor 1 for driving the rotating body 3.
1 as a speed control signal for the variable speed motor 1, while the variable speed electric motor 1
1, a speed detection generator 12 is connected to generate a generated voltage E3 proportional to the rotation of the rotating body 3, and a comparator 13 compares and controls both generated voltages E2 and E3 to obtain a predetermined deviation voltage. E2-E3 is transmitted to the speed control panel 14 as a speed control signal for the variable speed motor ll, and the variable speed motor 11
The cutting speed is proportionally controlled to follow the cutting speed.

Alternatively, to achieve mechanical synchronization, the rotation of the rotating shaft 6 may be controlled by the input shaft 1 of the transmission 15 via a gear or the like, as shown in FIG.
Tell 5a and cut it even more! No. 11: The amount of change in the diameter of the log due to forward movement is transmitted to the speed adjustment shaft 15b of the transmission 15 using, for example, the rotation of the feed screw 10 that moves the cutter 1, and the rotation speed of the log A and the rotation speed of the log A are transmitted. Changes in cutting speed due to changes in the diameter of the log (proportional to the position of the cutter l) are proportionally adjusted to output shaft 1.
5c, and faithfully transmits the rotation to the rotary body 3 to synchronize it.In this way, by making the rotational speed of the rotary body 3 and the cutting speed basically equal from the start of cutting, the delivery passage 5 The unloading of the veneer S at the time is facilitated.

Further, as described above, a delivery path 5 is formed by the rotating body 3 and the undulating member 4, and at the end of the delivery path 5, the veneer S is blocked in its advancing direction, and the rotating body 3
A guide member 15 having a guide surface 15a is provided so as to bend from the side (front side of the veneer) toward the back side (lead white 2 side).

The guide member 15 faces the undulating member 4, and one end thereof is placed in close contact with the surface of the rotating body 3 or in a plurality of grooves (not shown) formed in the rotating body 3, and the other end is undulating. It protrudes from the rotating body 3 side by a length sufficient to guide the veneer S against the drop from the apex of the member 4 to the lead white 2.

Therefore, a front crack Sa corresponding to the back crack is formed on the front side of the veneer S. Furthermore, this guide member 15 has the property of blocking the progress of the veneer S being fed, and by feeding the surface of the veneer S from the cutting edge to the guide member 15 with the rotating body 3, resistance in the opposite direction to the feed is created. The vessel was completely removed and the surface was cracked.
This ensures smooth unloading of the veneer to form the veneer S, and effectively prevents curling during the cutting stage. As shown generally in Figures 4a to 4d, the protrusions 3a and the diagonal grooves 3
b. Log A by providing notches in the form of parallel grooves 3C or by providing a wear-resistant material 3d such as urethane rubber.
By making good contact between the surface and the rotary body 3, the rotational force from the log A is reliably transmitted, and the feeding force for the veneer S in the feeding path 5 can be increased. Alternatively, the rotating body 3 is made of lightweight plastic, or by dividing it into multiple parts in the axial direction and making them rotatable individually.
Synchronous control from the start of cutting is not necessarily necessary, and even if it is merely a follow-up control, changes in cutting speed can be sufficiently followed. If it is further divided in the axial direction,
Since only the rotating body 3 that is in contact with the outer peripheral shape of the distorted log A rotates, follow-up rotation can be obtained with almost no impact due to speed differences.

Alternatively, as shown in Fig. 5.6, cutting edges 3e are provided radially on the outer peripheral surface at equal intervals, and portions without cutting edges (grooves indicated by dotted lines 3f) are provided at predetermined intervals in the axial direction. a rotating body 3 having
Alternatively, it is also possible to provide a large number of rotary bodies 3 having cutting edges 3e, that is, to divide them so that they rotate individually.

Incidentally, the guide member 15 may be provided so as to be accommodated in the groove-shaped portion 3f. In this case, both the raw wood surface immediately before cutting and the veneer S immediately after cutting are fed through the veneer delivery path 5 while simultaneously receiving the cuts sb. At this stage, the veneer S has already become flexible due to the cut Sb, and is bent backwards by the guide member 15 at the end of the delivery passage 5, so that there are numerous cracks Sa along the cut sb, causing curling. The prevention effect is significantly greater. (Fig. 7) Furthermore, since the veneer S is held from the front side by the cutting blade 3e and is forcibly fed, the veneer S does not become clogged and the flow is extremely smooth.

In addition to the above two examples, the relationship between these rotating bodies 3 and cutting speed is as follows:
For example, to compensate for the practical difficulty of perfect synchronization, a second
The circuit shown in the figure is modified as shown in FIG. 8, and a regulator 16 for manually adjusting the voltage E2 is provided, so that the generated voltage E2 is a voltage E2 corresponding to the circumferential speed of rotation estimated to be lower than the actual circumferential speed of the log. -Ex, and a circuit is configured such that the rotating body 3 can rotate at a slow circumferential speed proportional to the rotational speed. Furthermore, the rotating body 3 and the variable speed electric motor 11 are connected via an overrunning device (not shown), and in short, as shown in the graph of FIG. 9, the log peripheral speed Ul (cutting speed) and the rotating body peripheral speed U2 are respectively idling. At times, a slight speed difference Ul-U2 is generated, and the rotating body 3 comes into contact with the surface of the log during cutting, and the rotating body 3 immediately rises from U2 to Ul due to the action of the overrunning device. .

In the case of mechanical synchronization means (as shown by line Y, for example) or mechanical synchronization means (see FIG. 3), this can be easily achieved by changing the gear ratios at appropriate locations in the master-slave relationship to predetermined ratios.

Conversely, if the circumferential speed of the rotating body 3 is adjusted to be faster than the circumferential speed of the log A, it is possible to apply tensile force to the veneer immediately after cutting, especially when it has notches or urethane rubber. (Although not shown, the surface of the log and the rotating body are separated by Δg.

Alternatively, artificial synchronization can be achieved by driving the rotating body 3 at a constant circumferential speed, manually adjusting the rotational circumferential speed of the log A relative to the circumferential speed, and displaying the result using, for example, an electric speedometer. In this case as well, it is desirable to provide an overrunning device to make the circumferential speed of the log higher than the circumferential speed of the rotating body 3 and start cutting.

In addition, especially in the case of the rotary body 3 having a cutting blade 3e, since the raw wood A is cut by pressing the log A while cutting with the cutting blade 3e, the veneer cutting force can be applied by the driving force of the rotary body 3. You can also do it.

In this case, the power capacity of the variable speed electric motor 11 connected to the rotating body 3 is made larger than that of the variable speed main motor 7 that rotates the rotating shaft 6, or the main motor 7 and the rotating shaft 6 are If a limiter 1 or an electromagnetic coupling with a constant torque is connected, the driving force of the rotating body 3 will bear the actual veneer cutting force, and therefore the main motor 7 will be able to handle the idling torque of the log A and the lead white 2.
The Uke will have only the torque necessary to move it. As a result, the moment of force applied to the rotating shaft 6 to apply cutting force to the raw wood is reduced, and the veneer S is cut while being subjected to tensile force by the cutting blade 3e provided on the rotating body 3 and sent through the delivery path 5. Coupled with the bending action of the guide member 15, the curl prevention effect is also great.

As explained above according to the embodiments shown in the drawings, the first invention is such that the veneer immediately after cutting is carried out from the vicinity of the cutting edge of the cutter to the lead white by a rotating body having a cutting edge, a rotating body having notches, or Rotating body made of wear-resistant material such as urethane rubber,
It is fed through the delivery path synchronously with the cutting speed by a rotating body with or without the cutting speed.

That is, the veneer receives a forced feeding force up to the guide member provided at the end of the feed passage, so even if resistance is applied by the guide member, the veneer does not get clogged, and the curl can be corrected safely and reliably. It has characteristics.

Next, the second invention is an apparatus in which pressure bars or roller bars are alternately provided on the rotating peripheral surface of a rotating body at predetermined intervals in the direction of the blade.

That is, as shown in FIGS. 10 to 13, the rotary body 3 having a plurality of grooves 17 (indicated by dotted lines) formed on the circumferential surface 3g for one rotation is placed near the cutting edge of the cutter 1 as in the first invention. 1. from the lead white 2 veneer discharge surface. A part of the circumferential surface (approximately 1/4 of the rotating circumferential surface in the figure) is positioned parallel to the cutting tool. (In the figure, a rotating body 3 with a cutting edge 3e
However, it is not limited to this. ) Roller divided into the grooved portion 11 /< -18 or pressure bar 1
9 can be suppressed sectionally. As shown in FIG. 10.11, the roller par 18 has a structure that allows it to be easily attached to and removed from the stand 20.
A mini-bearing 18b is fitted to rod 1.
8a is housed in a groove 20a provided at the tip of the stand 20, and FIG. 11 is a view seen from the raw wood side. With the roller par 18 having this structure, the resistance of the roller par 18 itself is significantly reduced. Also, in the drawing, roller /<-1
8 shows the state of being discontinuous in the axial direction, but up to a certain interval, for example, the same effect as the conventional roller par, which is arranged continuously, can be obtained, and the force pushing the log A is This reduces the risk of breaking the wood due to pressing force, and further reduces cutting resistance.

Alternatively, as shown in FIG. 14, a plurality of roller bars 18 are provided on each of the plurality of roller bars 22 provided at the tip of the pressure plate 21, and +l123 is applied to the gap between each roller bar 18. It includes a rotating body 3.

The roller par 18 and the rotating body 3 are brought into contact with the raw wood A and are driven by the log A. With this structure, a conventional veneer lace cutting device can be easily modified to create a vehicle. The pressure bar 19 is mounted on a stand 20 as shown in Fig. 12.13, and a small piece of rigid body 19a is attached to the tip thereof so that it can be replaced, or it can be re-sharpened like a conventional pressure bar. Alternatively, as shown in FIG. 15, the pressure bar 19 can be cut out in the direction of the cutter, and a plurality of rotating bodies 3 can be provided in that part so as to rotate independently. These can be appropriately selected and used as required. Furthermore, an undulating member 4 is used to send out the veneer S immediately after cutting from between the cutter 1, the pressure bar 19, the roller par 18, and the rotating body 3 along the lower outer peripheral surface of the rotating body 3. A veneer feeding passage 5 with an appropriate gap is formed between the slope 4a having the undulating member 4 and the outer peripheral surface of the rotating body 3.

The undulating member 4 is configured to substantially become a convex portion on the single plate discharge surface of the lead white 2, and creates a drop from the lead white itself, and its apex 4b is located at the end of the delivery passage 5. The passage will be opened in that area. Further, in order to apply a forced feeding force to the veneer S in the delivery passage 5, to smoothly unload the veneer, and to eliminate various problems such as clogging, the rotating body 3 is set so as to match the cutting speed. It is configured to be rotatable. For example, the rotating body 3 may be in contact with the outer peripheral surface of the log A and be constantly driven by the rotation of the log, or as explained in the first invention, a drive mechanism may be connected to the rotating body 3 to electrically ,
A means of extraction can be used to perform mechanical tuning or to simultaneously apply most or part of the cutting force from the rotating body 3. Further, as described above, a delivery passage 5 is formed by the rotating body 3 and the undulating member 4, and at the end of the delivery passage 5, the veneer S is blocked in its advancing direction, and A guide member 15 having a guide surface 15a is provided so as to bend from the front side (front side) toward the back side (lead white 2 side). This guide member 15 opposes the undulating member 4 and has one end accommodated in the groove portion 17 of the rotating body 3, and the other end guides the veneer S against the drop from the apex 4b of the undulating member 4 to the lead white 2. It protrudes from the rotating body 3 side by as much as possible.

Therefore, a front crack Sa corresponding to the back crack is formed on the front side of the veneer S. Also, this guide member 15 has the property of blocking the progress of the veneer S to be fed, and by feeding the surface of the veneer S from the cutting edge to the guide member 15 by the rotating body 3, resistance in the opposite direction to the feed is created. This ensures smooth unloading of the veneer to form surface cracks Sa, thereby effectively preventing curling at the cutting stage, and preventing pressure bars,
The surface of the cut veneer also becomes good due to the action of the roller bar.

Note that the rotary body 3 with or without the notches shown in FIGS. 4a to 4d, a wear-resistant material such as urethane, or a cutting edge may be used. In addition, as shown in FIG. 16, a member 24a and a collar 24b, which serve as a substantial rotational outer circumferential surface, are fitted onto the shaft 24 so that the rotating outer circumferential surface can be replaced immediately in case of wear or damage. Furthermore, each of the members 24a may follow the cutting speed each time it comes into contact with the log A through a running device (not shown). In any case, since it is sufficient that the rotating body 3 rotates in synchronization with the cutting speed of the raw wood A, the rotating means thereof can be selected as appropriate.

Regarding feeding white lead, in addition to the usual means of turning a feed screw from a rotating shaft via a gear etc., especially when cutting by supplying power from a rotating body other than a main motor,
The rotation of the rotating shaft is converted into pulses using a transducer,
It is also possible to drive a separately provided pulse motor using the pulse command to transmit the feed amount and feed speed to the feed screw.

As described above, the present invention prevents so-called curling, in which the veneer curves upward immediately after cutting, during the cutting process, and the device itself for preventing this prevents the veneer from clogging. It has a series of automations including veneer laces, and has an improved complex function that eliminates all problems and facilitates smooth cutting delivery.
Labor saving can be promoted. Therefore, in the cutting process, etc., you do not have to artificially spread out the curls to make them flat, and
Insertion of the veneer into a processing machine etc. is facilitated, and there is no need to provide various equipment such as a tenderizing device as a width machine.

In addition, the veneer immediately after cutting is discharged by being given a forced feeding force by a rotary body that is rotatable in accordance with the cutting speed, and as mentioned at the beginning, unlike conventional equipment,
It is possible to eliminate all phenomena such as the veneer just after being cut getting stuck between the backing plates for correcting curls due to the resistance. Therefore, the present invention provides a practical cutting device that can reliably prevent curling, and brings about dramatic progress and labor savings in the plywood manufacturing process.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory diagram for explaining the present invention in detail, Fig. 2 is an explanatory diagram of the device drive mechanism of the present invention, Fig. 3 is an explanatory diagram of the horizontally thin implementation of the device drive mechanism of the present invention, Fig. 4a, 4b, 40th,
Fig. 4d is an embodiment of the rotating body 3, Fig. 5 is an embodiment of the rotating body 3 having a cutting blade, Fig. 6 is an explanatory diagram of the rotating body 3 having a cutting blade, and Fig. 7 is after curl correction. 8 is an explanatory diagram of another control method of the drive mechanism, FIG. 9 is a graph showing the relationship between the cutting speed and the speed of the rotating body provided with the overrunning device, and FIG. 10 is the diagram of the second veneer. Embodiment of the invention having the second pressure bar, FIG. 11 is a front view seen from the raw wood side of FIG. 14 is another embodiment of the invention having a second roller bar; FIG. 15 is another embodiment of the invention having a second pressure bar; FIG. The figure shows rotating body 3
Example A: raw wood, S: veneer, Sa: cracked surface, sb: depth of cut, l: knife 1.2: white lead, 3: rotating body, 4:
- Undulating member, 4a...Slope, 4b...Vertex, 5...Sending passage, 6...Rotating shaft, 7...Main motor, 8...DC generator, 9..., Variable resistor, lO/Φ Feed screw, 11
・・Variable speed motor, 12・Speed detection generator, 13・
・Comparator, 14...Control panel, 15φ・Transmission, 16...
Adjuster, 17...Groove section, 18...Roller bar, 1
9...Pressure bar, 20...stand, 21--pressure plate, 22mm one roller bar, 23...shaft, 24φ.
Shaft, 3a, 3b, 3C notch, 3d--Abrasion resistant material such as urethane rubber, 3e... Cutting blade jI5FjA 3e Fig. 6 1g Fig. 7 → Time

Claims (1)

[Scope of Claims] l A rotating body that is capable of rotating in the discharge direction in relation to the veneer cutting speed is arranged so that a part of its outer circumferential surface is located from near the cutting edge of the knife to the lead white veneer discharge surface. A undulating member is provided in white lead parallel to the cutting tool and sends out the veneer just after cutting from between the cutting edge and the rotating body along the lower outer circumferential surface of the rotating body. A veneer delivery path is configured with an appropriate gap between the veneers, and a guide member is provided at the end of the delivery path to face the undulating member and bend the veneer to be sent out from the rotating body side toward the back. Features: Cutting device to prevent curling of veneer lace. 2. The device according to claim 1, which is a rotating body having cutting blades arranged radially at equal intervals on its outer peripheral surface and having portions without cutting blades at predetermined intervals in the axial direction. 3. The device according to claim 1, wherein the rotating body is provided with notches on its outer peripheral surface. 4. The device according to claim 1, wherein the rotating body is provided with a wear-resistant elastic material on its outer peripheral surface. 5 Claim 4 in which the elastic material is urethane rubber
Apparatus described in section. 6. The device according to any one of claims 1 to 4, comprising a variable speed electric motor that is controlled in a follow-up manner in synchronization with the veneer cutting speed and connected to a rotating body. 7. A rotating body that is rotatable in the discharge direction in relation to the veneer cutting speed and has a rotating circumferential surface at a predetermined interval in the axial direction is rotated from near the cutting edge of the cutter to the white lead veneer discharge surface. an undulation member that is provided parallel to the cutter so that a part of the outer circumferential surface thereof is located at the lower edge of the cutter, and sends out the veneer immediately after cutting from between the cutting edge and the rotating body along with the lower outer circumferential surface of the rotating body; is provided in white lead to form a veneer delivery path having an appropriate interval between the guide member and the rotating body, and a guide member that faces the undulating member and bends the delivered veneer from the rotating body side to the back side. A cutting device for preventing curl of a veneer lace veneer lace, characterized in that a pressure bar or a roller bar is provided at the end of the delivery passage and further provided in a groove-shaped portion of the rotating body having a rotating peripheral surface at a predetermined interval. 8. The device according to claim 7, which is a rotating body having cutting edges radially spaced at equal intervals on the rotating circumferential surface. 9. The device according to claim 7, wherein the rotating body has notches on its outer circumferential surface. Device. 10. The device according to claim 87, wherein the rotating body is provided with an abrasion-resistant elastic material on its outer peripheral surface. 11. The device according to claim 10, wherein the elastic material is urethane rubber. 12. Apparatus 3 according to claim 7, wherein the pressure bar or roller bar is provided by dividing the surface of the raw wood at the cutting edge so as to be able to press the surface of the raw wood sectionally. An apparatus according to any one of claims 7 to 10, comprising an electric motor connected to a rotating body. 14. The device according to any one of claims 7 to 10, which is a rotating body divided into multiple rows in the direction of the blade so that each rotates independently.