JPS5818210A - Supporting shaft for material wood for 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 is achieved by inserting the material into a central hole drilled at the center of rotation of the raw wood.
The present invention relates to a log support shaft for veneer lace that supports the log.

Conventionally, regarding this type of support shaft, 1, for example, Utility Model Application No. 56-2
A technology according to Publication No. 1506 (title of invention: wood rotary cutting device) already exists. According to the publication, the support shaft has a large number of claws.

It is characterized by being configured so that it can be moved in and out from the outer circumferential surface, and after the shaft is fitted into a pre-drilled center hole of the log, a force is applied from the inside of the center hole outward using hydraulic pressure, etc. , the protruding claws 1 are bitten into the inner circumferential surface of the claws 1 to support the raw wood.

However, it is well known that logs have various types of cracks such as cracks due to growth stress and drying cracks, and with this type of support shaft, these cracking forces can increase or even increase. Even if no such expansion is visible, the stress remains inside and is supported, and as the cutting progresses with the veneer race and the diameter of the log progresses, new cracks will occur. Otherwise, it may lead to expansion.

That is, in all conventional support shafts of this type, the shaft applies force from the inside of the center hole to the outside.

Alternatively, since such a stress state remains and the log is supported by it, the limit diameter of the log that can be cut with the veneer race naturally increases with such conventional technology. It had an inherent drawback that it could not be used.

It is an object of the present invention to provide a support shaft that does not cause an oblique load on logs or that can significantly reduce the load even if the support shaft intervenes, and thus provides a support shaft that does not cause an oblique load on logs or can significantly reduce the load. A small diameter tree.

Or in general, such as lauan and other South Sea wood cores.

The aim is to establish the basis for a veneer lace that can be cut to smaller diameters, and the details are as follows.

First, the example shown in FIG. 1 is a simplified diagram of a log l having a support shaft 2 according to the present invention inserted into the center of rotation, and FIG. It illustrates the situation.

Of course, the position of the support shaft 2 determines the rotation center of the log 1,
Particularly in the case of conifers, the center of rotation and the center of the tree's rings (the center of the growth rings) are actively different.

The cut veneer has diagonal natch marks forming the annual rings, and such a veneer has fewer irregularities. 1 in the diagram
3 is the mounting base of the veneer lace. 〇 Figures 8 to 6 show a state in which a center hole is drilled through the center of rotation of the raw wood 1, and the oblique support shafts 2 and 4 are inserted therein. is illustrated. In addition, in the case of Figures 7 to 10, the center hole is
The figure shows a state in which the support shaft 4 is inserted into a hole drilled to an appropriate depth from the two rainwater holes or from the butt end of one side without penetrating the hole. Specifically, the support shaft 2 shown in FIG. 8 is handled separately from the veneer lace, and after being inserted into the log 1 at a separate location as shown in the figure, the shaft 2 is supported by the chuck 8 of the veneer lace. In this case, the manner of engagement between the support shaft 2 and the chuck 8 is mechanical, electrical, and similar to other known clutch mechanisms.

In addition, in Figures 4 to 1θ, 4 in Figure 1 is a support shaft similar to the above-mentioned 220, but it is configured to be integrated with a veneer race. Equivalent to. Hereinafter, 4 will be referred to as a spindle. Therefore, in the case of FIG. 4, as soon as the raw wood 1 with a drilled center hole is fed to the veneer lace, the spindle 4 is inserted into the center hole from one side and engages with the chuck 8 on the other side, as shown in the figure. After the cutting is completed, the core is pulled out or removed as necessary, and the machine retreats to prepare for the next supply of logs. Further, in the case of FIG. 6, the spindles 4 are inserted into the center hole from both sides, and if necessary, both spindles 4 are engaged with each other or mutually pivotally supported in the center hole as shown in FIG. Similarly, in the case of Fig. 7, the spindle is inserted into the unpierced center hole as shown in the figure, and in the case of Fig. 8, it is inserted deeper, and a gripping force is applied by the unevenness formed at the tip of the spindle. Further, as shown in FIG. 9, a well-known double spindle mechanism is employed to directly grip the end of the log 1 with the large chuck 6. Of course, the forward limit of the tool post should be determined by the spindle 4, and the large chuck 5 will move back at an appropriate time, resulting in the state substantially shown in FIG. 8. The example shown in FIG. 10 is the simplest one, with one side having a chuck 14 that acts directly on the end surface of the log l. The other side consists of a spindle 4 that is inserted into the center hole, and has a concave and convex portion at its tip.

In any case, the known support shafts, as well as the support shafts according to the present invention, in relation to the known veneer laces of the center drive type, the peripheral drive type, or a combination thereof,
A chuck 8 that is used as a diagonal or a conventionally known chuck 8
(acting on the support shaft), 5 and 14 (acting directly on the log), and of course, in addition to the one shown in the figure, the examples shown in the single figure can be combined with each other in many forms, The details of the support shaft provided by the present invention are as follows.

Namely, the support shaft of the present invention is made of stainless steel,
The support shaft 7 shown in FIG.
It is constructed as shown in Fig. 13 by generalizing 2 and 4 above, and when used, the shaft 7 is inserted into the center hole 6 of the log 1 shown in Fig. P as shown in Fig. 13. However, as is clear from Figure 1, the main reasons are that the protrusion 8 is formed on the outer circumferential surface of the support shaft 7, and the cutting edge is attached to the leading end of the protrusion 8 in the insertion direction. It has the following characteristics. According to the side view illustrated in FIG. 14, the protrusion 8 has a protrusion 8 that extends continuously in the axial direction of the support shaft 7, and has a cutting edge at its leading end. It is clear that there are

Further, as shown in FIG. 15, the shaft has a chip pocket 10 for storing wood chips cut by the cutting edge of the projecting body 8. Therefore.

Basically, when the support shaft 7 is being inserted into the center hole as shown in FIG. 13, or even after it has been inserted, a large force continues to be applied from the inside to the outside of the center hole. is reduced. This is because the rate at which the protruding body 8 forcibly deforms and intervenes in the wood fibers of the log 1 can be significantly reduced by cutting off the wood fibers with the cutting edge of the protruding body 8 .

Of course, depending on the form of the cutting blade, it is possible to remove all of the wood fibers without deforming them at all, but this is not necessarily the best option and may cause deformation and cutting of the wood fibers. Practically speaking, it is desirable that cutting is performed with a blade. However, it is important to create a cutting edge that at least produces chips, that is, allows for some cutting.

Along with this, consideration should be given to removing chips as necessary. In particular, the removal of wood fibers by the cutting blade.

Generally, cutting is carried out in a unique manner in which the cutting direction is in the same direction as the wood fibers, so the occurrence and progression of tip cracking is remarkable.9 Even though cutting is done with a cutting blade, the cutting surface becomes rough, but this is not the case. There is no particular problem in itself. In any case,
The cutting edge of the leading end of the shaped body 8 is shown in Figures A and N.
example.

Shown in enlarged view. In Figure A, a cutting edge is attached to the outermost position of the projecting body 8 with a cutting edge angle A, but the other angle B is 90 degrees. According to experiments, the blade angle A is approximately 75 to 15
It was adopted within the range of degrees, and a preferable result was obtained between I and 50 degrees. At the same time, the angle B is not limited to what is shown in the figure, but can be changed as appropriate. Also, in Fig. 4.

While the angle A is in degrees, the blade angle B is 75 to 15 degrees.
It is a cutting edge with a degree of precision. Although it is certain that any of them functions as a cutting edge, it is desirable to add a cutting edge with an edge angle of about 75 degrees or less as a characteristic feature of the specific cutting edge referred to in this application.

Of course, a cutting edge that combines the cutting edges shown in Figures A and N would be even better, and in addition, it would be better if it had a protruding shape at the rear in the direction of travel of the cutting blade, and the relief angle could be adjusted.

Set clearance (relief clearance) as necessary. still,
Various examples of the cross-sectional shape perpendicular to the axis of the protruding body 8 are shown in Figs. can be,
Further, the protruding body 8 in FIG. U is a separate structure that can be attached and detached, but in either case, the cutting edge is formed as described above.

Regarding the protruding body 8 made of rice and provided with a cutting edge, its specific structure has the above-mentioned cross-sectional shape and something similar thereto, and has a continuous shape as illustrated in FIGS. 11 and 14. In addition to being formed into 2 parts, it is also possible to divide it into two parts or other suitable parts in the direction of the grain. However, even if they are formed separately, it is preferable to arrange them in rows in the axial direction rather than forming them in a completely scattered state.
That is, it is formed following the cutting edge at the leading end. Furthermore, the protrusions 8 do not necessarily have to be arranged evenly over the entire length of the center hole of the log 1, but if desired, they can be formed concentrated at the tip or rear end of the support shaft. Good too. Furthermore, although not shown, the protruding body 8 may have a lead relative to the axis of the support shaft, such as a screw, and in such a case, it will naturally rotate and connect to the center hole. It will be inserted into. Furthermore, as shown in FIG. 15, it is more stable to form the protrusions 8 uniformly and radially, and the number of protrusions 8 is 8 or more (9
) The following are appropriate. In addition, the height C of the protruding body 8 indicated in FIG. 1 and FIG.
．． 5 times or less and 1 m or more is appropriate, and by making the dimensions and shape of the part of the support shaft 7 other than the protruding body 8 the same as the dimensions and shape of the center hole 6 drilled in the log 1, the log The deflection of the relief 3 during cutting can be reduced, making it suitable for reducing the diameter of the core.

A support shaft 7 having a protruding body 8 with an inclined cutting edge attached thereto.
When inserted into the center hole 6 of the log l shown in Figure ν,
Some wood chips with the cutting edge.

As mentioned above, it is inserted while producing chips,
As shown in FIG. 15, the wood chips are stored in the chip pocket 10, or if no such pocket is provided, the support shaft 7 is inserted while being pushed forward in the insertion direction. For example, in the support shaft 7 whose side view is shown in FIG. 16 and the front view is shown in FIG. 17,
In order to form the chip pocket 10 in a preferable manner, since the shaft is formed as a hollow shaft, the chips can be inserted while being guided backwards from the cutting blade, but in the case of a solid shaft as shown in Fig. 11. will be pushed forward. still.

11 in FIG. 16 is a guide body provided at a position preceding the cutting blade and fitted into the center hole 6 of the log 1 described above,
The cutting blade prevents the support shaft 7 from being inserted to one side. The illustrated one has a dome shape consisting of four riches, but this guide body 11 has a diameter of
Based on the same dimensions, it is desirable to use a slightly smaller outer diameter.

Its shape is not limited to just a dome shape, but also something like a solid tapered shaft.

Other shapes may be formed as desired. The important thing is that guide 11
By providing at least a position preceding any of the cutting edges, it is possible to

Even if there is a misalignment at the initial stage of insertion, a centripetal action is automatically obtained by a simple insertion operation, and the support shaft 7 can be guided and inserted without excessive deviation. 9 In the present application, only the protruding body 8 of the support shaft 7 is basically inserted while substantially cutting and deforming the inner circumferential surface of the central hole 6 of the log 1. The center hole 6 of the log 1 to be installed is.

The portion of the support shaft 7 other than the protrusion 8 is bored in a size and shape that do not require it. However, in practice, it is accompanied by deviation at the initial stage of insertion or instability of the size and shape of the center hole. It is more practical to form a cutting edge also at the leading end. Therefore, in the present invention, at least the projecting body 8. Desirably, a cutting blade is also provided in addition to the above. Further, as illustrated in FIG. 14, when the cutting edge or guide body of the tip of the support shaft 7 is damaged from the joint indicated by 9, and when wood chips are removed from the chip pocket.

It would be extremely convenient if one could be detached or replaced at any time.

As shown above, the support shaft 7 of the present invention is used as described above in relation to the veneer race, but as the cutting progresses, the load acting on the support shaft with the conventional support shaft is reduced. The present invention has made it possible to prevent or reduce the occurrence of cracks that bisect the circumferential direction, or to promote existing cracks. This is a unique feature of veneer lace, which can be cut to extremely small diameters. The resulting improvement in yield and the utilization of small-diameter wood will be provided to the plywood manufacturing industry, making an extremely large contribution.

[Brief explanation of the drawing]

Figures 1 to 10 are simplified explanatory diagrams for explaining the usage of the raw wood support shaft for veneer lace according to the present invention, and Figures 1 and 8 to 10 are its front view, and Figure 2 is its side view. . 11, 14, and 16 show a part of the shaft, with FIG. 11 being a perspective view, and the rest being side views. Further, Fig. u is a cross-sectional view of the raw wood at the time when the shaft is inserted, and Fig. v is a cross-sectional view of the log before it is inserted. FIG. 15 is a front view of FIG. 14, FIG. 17 is a front view of FIG. 16,
FIGS. Figure 2 and Figure 1 are partial perspective views showing a part of the shaft in an enlarged manner.
2. Support shaft. 3...Chuck, 4...Spindle, 6...Medium 0 hole, 7
...Support shaft, 8.Protruding body, 11.Guide body...
It is. Patent applicant Meinan Seisakusho Co., Ltd.

Claims (1)

[Scope of Claims] 1. A raw wood support shaft for a veneer lace that is inserted into a center hole drilled at the center of rotation of the raw wood to support the raw wood, in which a protrusion is formed on the outer peripheral surface of the shaft, and at least the protrusion is formed on the outer peripheral surface of the shaft. A support shaft for a veneer lace, characterized in that a cutting blade is attached to the leading end in the insertion direction of the shaped body. 2. In a raw wood support shaft for veneer lace that is inserted into a central hole drilled at the center of rotation of the raw wood to support the raw wood, a protruding body is formed on the outer peripheral surface of the shaft, and at least a leading edge in the insertion direction of the protruding body is provided. A support shaft for a veneer lace, characterized in that a cutting edge is attached to the end, and a guide body that fits into the center hole is provided at a position preceding any of the cutting edges.