JP2019111780A - Veneer lathe - Google Patents

Abstract

To prevent a decrease in a product value of a veneer by preventing blackening due to the reaction between tannin and iron in a case that claws of a rotating body deeply bite into raw wood when cutting the veneer out of the raw wood using a veneer lathe.SOLUTION: A veneer lathe 10 comprises: a spindle 11 rotatably supporting raw wood through chucking both butt ends at a center of the raw wood 1; a cutter 14 cutting the raw wood; and a rotating body 17 provided with a large number of claws 16 biting into the raw wood near cutting sections, being arranged opposite to the cutter, wherein the claws are made of stainless.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a veneer lace for producing veneers used for plywood and veneer laminate (LVL).

A veneer race is known, for example, in Patent Document 1 and its schematic configuration is shown in FIGS. 1 and 2. That is, the veneer race 10 comprises a spindle 11 that chucks and rotatably supports the center of a roughly cylindrically shaped raw wood 1 from both sides and a support roll 12 that holds and positions the raw wood 1 from the side and below. , 13, a knife 14 for cutting the lumber 1, a pressure bar 15 for pressing the cutting position of the lumber 1 toward the knife 14, and a rotating body 17 provided with a large number of claws 16 on the outer periphery, By cutting the claws 16 of the rotary body 17 rotationally driven in the direction of the arrow into the raw wood 1, the cut portion of the raw wood 1 is fed into the knife 14 and cut to manufacture the veneer 2. The rotary body 17 having the knife 14, the pressure bar 15 and the claws 16 is all provided on the movable pedestal 18.

In the veneer lace 10 of such a configuration, the rotating body 17 having the claws 16 is generally made of iron.

Patent No. 2796799 JP 11-147207 A

As shown in FIG. 3, the surface 2 b of the veneer 2 manufactured by the veneer lace 10 remains as a fine groove 3 as the trace of the claw 17 digging in, so the opposite surface 2 a of the veneer 2 is It is regarded as the surface. However, wood contains tannins, and when a fine groove 3 is formed by scooping iron claws 17 to a predetermined depth from the back surface 2b side of the veneer 2, the tannins in the groove 3 And iron ions react to form iron oxide, so it turns black. As already described, the veneer 9 as a product has a surface 2a opposite to the surface 2b on the side where the claws 8 are formed, and in many cases this discoloration is a veneer Although it does not appear on the surface 2a, depending on the relationship between the thickness of the veneer 2 to be manufactured and the depth of penetration of the claws 17, the color may reach near to the veneer surface 2a and the surface is sanded during production Occasionally, discoloration appears on the surface of the single sheet 2a and is visually observed, and the commercial value may be greatly impaired. In addition, in FIG. 3, the code | symbol 4 shows wood grain and the arrow 5 shows a fiber direction.

In Patent Document 2, a blade of a high-speed tool steel or a high-speed tool steel equivalent material is brazed to a base metal formed of a ferritic stainless steel with respect to a blade of a slicer for producing a veneer for decoration (projected plate) It has been proposed to prevent the phenomenon (blue stin) of contaminating a veneer surface by reaction between tannin in wood and iron in the knife by using the above-mentioned. This prior art is directed to a cutting tool which is a cutting tool for cutting a veneer from wood. Therefore, when applying this technical concept to the veneer race 10, it is possible to apply the same solution to the cutting tool knife 14, even if it would be easily conceivable to a person skilled in the art. It can not be said that applying the same solution to the ten nails 16 and the rotating body 17 is easily conceived by those skilled in the art. As described above, the veneer 2 manufactured by the veneer lace 10 only appears on the back surface 2b side of the veneer 2 as a product even if similar discoloration occurs in the scooping groove of the nail 16, so Although it has been considered that no particular problem occurs, the present inventor has completed the present invention, noting that sanding performed during productization may also expose the veneer surface 2a. It is.

That is, the problem to be solved by the present invention is to prevent black discoloration due to the reaction between tannin and iron, even when cutting a veneer from a raw wood with a veneer lace, even if the claws of the rotating body dig into the raw wood. To reduce the product value of the veneer.

In order to solve this problem, the invention according to claim 1 of the present application is provided with a spindle for chucking the butt of a raw wood from both sides, a knife for cutting the raw wood, and a knife facing the knife to crawl around the cutting position of the raw wood. In the veneer lace having a rotating body with a large number of claws to be inserted, the claws are formed of stainless steel.

The invention according to claim 2 of the present application is characterized in that in the veneer race according to claim 1, the rotating body and the claw are integrally formed of stainless steel.

According to the present invention, since the claw that crawls into the vicinity of the cutting position of the raw wood is formed of stainless steel, even if the claw of the rotating body crawls into the raw wood, it does not turn black due to the reaction between tannin and iron; Can prevent the decline in product value of

It is a schematic block diagram of the veneer race according to one embodiment of the present invention. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the state in which the nail | claw of a rotary body bites in and a fine groove | channel is formed in the single plate back surface. It is a detail view of a rotating body. It is a detail view of a rotating plate used for a rotating body.

Hereinafter, a veneer race according to an embodiment of the present invention will be described in detail. The basic configuration of this veneer race 10 is the same as the basic configuration shown in FIGS. 1 and 2 referred to in the description of the background art, but for the specific configuration of the rotating body 17 provided with the claws 16, FIG. This will be described with reference to FIG.

The rotating body 17 is composed of a plurality of rotating plates 21 provided in parallel at a predetermined interval 20 in the axial direction on a shaft 19 serving as a rotating shaft. Each rotary plate 21 is in the form of a saw plate having claws 16 provided on the outer periphery thereof, and an attachment hole 22 for inserting the shaft 19 is formed on the inner periphery thereof. The fitting convex portion 23 is formed to project toward the shaft 19. The fitting convex portion 23 is fitted in a fitting groove 24 extending in the axial direction of the shaft 19 so that relative rotation with respect to the shaft 19 is achieved. It is fixed so as not to rotate, that is, to rotate integrally with the shaft 19. A ring-shaped spacer 25 is provided between the rotary plates 21 to provide the predetermined interval 20.

The rotating body 17 of such a configuration can be assembled as follows. That is, the shaft 19 is inserted through and attached to the mounting hole 22 of the rotary plate 21 at a relative angular position where the fitting convex portion 23 of the rotary plate 21 is fitted to the fitting groove 24 of the shaft 19. The spacer 25 is inserted between them to obtain the rotating body 17 shown in FIG. The rotating body 17 is attached to the pedestal 18 (FIGS. 1 and 2). By rotating the shaft 19 at a predetermined speed in a predetermined direction (the direction of the arrow in FIG. 2) by a motor (not shown), the rotary plates 21 rotate at the same speed in the same direction, and the claws 16 on the outer periphery thereof Then, the wood 1 is rotated in a predetermined direction (arrow direction in FIG. 2). When the claws 16 of the rotary plate 21 wear, the rotary plate 21 can be replaced by removing the rotary body 17 from the pedestal 18 and removing the rotary plate 21 from the shaft 19. The pressure bar 15 (FIGS. 1 and 2) is a plate having a predetermined width, but has a predetermined length (height direction) at its tip and a slit having a width slightly larger than the thickness of the rotary plate 21. A plurality of (not shown) are formed in parallel, and the comb-tooth-like portion left between the slits extends downward through the gap 20 between the rotary plates 21 to cut the cutting position of the raw wood 1 with the knife 14 (see FIG. It is configured to press toward (1, 2).

The method of cutting the veneer 2 from the raw wood 1 using this veneer lace 10 is performed in the same manner as in the prior art. That is, referring to FIGS. 1 and 2, when raw wood 1 which has been peeled in advance and shaped into a substantially circular cross-sectional shape and cut into a predetermined length dimension is inserted into veneer race 10, support roll 12 is obtained. 13, and after centering by supporting the wood 1 from the side and below from the center, the center of the wood 1 is chucked by the spindle 11 from the both sides of the butt. Then, while rotating the rotating body 17 at a predetermined speed in the direction of the arrow in FIG. 2, the anchor 18 is moved at a low speed in the direction approaching the raw wood 1 (left direction in FIGS. 1 and 2). As a result, when the claws 16 of the rotating body 17 dig into the outer peripheral surface of the lumber 1, the lumber 1 rotates in the direction of the arrow in FIG. 2 and is cut to a predetermined thickness by the knife 14 and the veneers 2 are continuously Manufactured. Since the diameter of the raw wood 1 is gradually reduced by cutting into the single plate 2, the ladle 18 further moves in the left direction in synchronization with this diameter change. In this way, when the raw wood 1 is cut to the limit, the lower support roll 13 retracts to the side, and the raw wood 1 after the cutting ends falls and is externally transferred by a conveying means (not shown) such as a conveyor. Exhausted. The rotational body 17 may be rotationally driven, and the spindle 11 may be rotationally driven.

The present invention is characterized in that the rotating body 17 of such veneer race 10 is formed of stainless steel, and whether or not discoloration occurs due to the oxidation reaction of tannin when the veneer contacts metal. In order to confirm, the test was conducted in the following manner.

As a test material, four red and white materials of cedar veneer are prepared, and on each test material, iron plate (25 × 50 mm), copper plate (30 × 100 mm), aluminum plate (30 × 100 mm), stainless steel A plate (20 × 100 mm) was placed, and the same test material was placed on top of it to make a lid, and after standing for 13 hours at normal temperature, the presence or absence of discoloration was observed. The results are as shown in the following table.

From this result, according to the prior art in which the claws 16 of the veneer lace 10 are made of iron, the back surface 2b of the obtained veneer 2 turns black, especially in the case of red wood, and the phenomenon is remarkable. There is concern that the product value will be greatly reduced. Replacing this with copper does not completely solve the problem.

Although aluminum does not cause a phenomenon of blackening due to reaction with tannin even when it comes in contact with a veneer, it is not suitable for the material of the claws 16 that dig into the raw wood 1 because the material is soft.

Stainless steel is considered to be suitable as a substitute material for the nail 16 because it has the same hardness and strength as iron, in addition to the fact that even when it comes in contact with a veneer, it does not cause a phenomenon of blackening due to reaction with tannin. Be That is, by making the claws 16 (the whole including the rotating body 17 when integrated with the rotating body 17) made of stainless steel, the same action or function as the conventional one is exhibited, and iron oxide is generated by reacting with tannin. It has been confirmed that the effect of preventing the reduction of product value can be obtained by preventing discoloration due to

From this test result, in the veneer 2 manufactured using the veneer lace 10 of the present invention in which the claw 16 of the rotating body 17 is made of stainless steel, the groove 3 as a trace of the claw 16 digging in is formed on the back surface 2b. It has been demonstrated that veneers 2 having good aesthetics are produced without discoloration of the inside and the periphery of the grooves 3 although they are (see FIG. 3).

In addition, since the groove 3 is formed by the claw 16 digging into the raw wood 1, it is sufficient if the claw 16 is made of stainless steel, but generally, the claw 16 is a rotating body 17 21) and is integrally formed with the same material, in this case, the claws 16 and the rotating body 17 are made of stainless steel. However, if the claw 16 formed as a separate member from the rotary body 17 (rotary plate 21) can be firmly fixed to and integrated with the outer periphery of the rotary body 17 (rotary plate 21), only the claw 16 is stainless steel. It is also within the scope of the present invention to make it.

Reference Signs List 1 log 2 veneer 2a front surface 2b back surface 3 claw feeding groove 10 veneer race 11 spindle 12 side support roll 13 lower support roll 14 knife 15 pressure bar 16 claw 17 rotary body 18 base 19 shaft 20 interval 21 rotary plate 22 mounting hole 23 fitting projection 24 fitting groove 25 spacer

Claims (2)

A veneer race comprising a spindle for chucking the lumber of the lumber from both sides, a knife for cutting the lumber, and a rotating body provided opposite to the knife and provided with a large number of claws for digging around the lumber cutting location. Veneer lace characterized in that the nails are formed of stainless steel. The veneer race according to claim 1, wherein the rotating body and the claws are integrally formed of stainless steel.