JPS594284B2 - Manufacturing method of reinforced veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides the following methods:
The present invention relates to a method for manufacturing a reinforced veneer in which the veneer veneer and the wire rod are engaged and reinforced.

Normally, raw wood has many cracks such as sun cracks and water cracks, and when cutting this with veneer lace, the cracks that existed in the raw wood will not only appear as cracks in the veneer. , Processes after veneer lace, such as breakage in the cutting process, supply to a dryer, drying, and removal process, are processes in which the veneer is handled at least by artificial means, to prevent cracks that exist in the veneer from the beginning. The handling of the veneer is deteriorated due to the increase in size, breakage, and the occurrence of new cracks, etc., and a large number of unsuitable parts are generated, resulting in a significant decrease in yield and quality.

Various proposals have been made with the intention of overcoming these problems.

For example, as shown in Japanese Patent Publication No. 51-1764 "Veneer Joining, Reinforcing Method and Apparatus", a cut is made at the end of the veneer to an arbitrary depth, and a wire is inserted into the cut in a nearly straight line. There is a method of reinforcing the structure by inserting it, but there is a limit to the thickness of the veneer that can be applied to this method, and it has been difficult to put it into practical use with thin veneers.

Another method is to cut a wedge-shaped groove straight from the surface of the veneer and insert a thread containing adhesive or water into the groove.

Alternatively, as shown in JP-A-51-151311 ``Method of joining green veneers with thread'', a process of cutting several diagonal cutting grooves with a knife in a direction orthogonal to the fiber direction of the main veneer. There is a bonding method consisting of a bonding method and a bonded veneer obtained by this method (Japanese Patent Laid-Open No. 53-18706), but these methods cut the fibers of the veneer uniformly and continuously, resulting in a significant decrease in the strength of the veneer. Also, since the threads are basically glued into the grooves formed in the veneer, an adhesive is not necessary, and it is difficult to immediately obtain the desired adhesive force, especially with green veneers. This was extremely difficult and could not be put to practical use at all.

The present invention solves the drawbacks of the above-mentioned conventional methods and provides a simple and economical method for manufacturing reinforced veneers without reducing strength.The present invention will be explained below based on the embodiments shown in the drawings.

That is, as illustrated in FIGS. 1 and 2, the veneer S cut by a cutting device (not shown) such as a veneer lace is transported by a conveying device (not shown) such as a chain conveyor or anvil roller. At the same time, sealed cuts 1 are formed in the veneer S at arbitrary intervals across the direction of the fibers, penetrating the fibers in the length and thickness direction to cut them.

As a means for this, as shown in FIGS. 3 and 4, a rotary knife 3 provided with sharp piercing blades 2 at a desired pitch on the outer periphery is rotated at the same speed as the transport speed of the veneer S, or , knife 4
A cut 1 of a predetermined length is formed by a cutting member A that pierces at regular intervals.

It is sufficient if the length of the cut is as much as 5 mm, but if some margin is taken into consideration, a length of about 1 to 3 crrL is practically sufficient.

In addition, the width of the cut 1 is determined by actually forming the cut 1 from one side of the veneer S, as shown in FIGS. 5a and 5b, and cutting the cutting member A.
1. For example, if the depth is regulated to such an extent that the cutting edge of the knife 4 slightly protrudes toward the other surface, after the knife 4 has finished piercing, the width will be almost gone as the veneer fibers will recover. ,
A sealed cut 1 is formed, and the engagement of the wire rod 5 with the veneer S is improved as will be described later.

Note that this cut 1 is made in the direction perpendicular to the fiber direction of the veneer S.
Form in rows or more, preferably near the end of the veneer.

Next, a part of the continuous wire 5 made of synthetic fibers, natural fibers, composite fiber yarns thereof, soft metal fine wires, etc. is inserted into the cut 1' on one side as shown in FIGS. 1 and 2. The wire rod 5a of this protruding portion is pressed into the surface and protrudes from the other surface, and the wire rod 5a of this protruding portion is hooked onto the veneer fiber of the cut 1, and
A reinforced veneer is obtained by engaging the veneer S and the wire rod 5 in such a way that the wire rod 5a closes the veneer S with the wire rod 5a.

(See Fig. 6) That is, the cut 1 is formed in an almost sealed shape, and the wire 5 is substantially larger than the cut 1, or at least has a larger apparent wire cross section. The wire rod 5 is selected so that it is larger than the gap between the notches 1, and the twisted fibrous yarn has a circular cross section, so it is better caught in the notches 1. You can get the result.

Alternatively, in order to increase the friction between the wire rod 5 and the veneer S and actively prevent it from coming off through the cut 1, the wire rod 5 may be impregnated with resin or rubber thread adhesive, for example. It may be.

As a means for sequentially engaging a part of the continuous wire 5 with the veneer S, the wire 5 is hooked to the tip using a press-fitting member 6 having a recess 6a, and the wire 5 is press-fitted into the notch 1, and the other is After the wire rod 5 is made to protrude toward the surface, the press-fitting member 6 is pulled out.

(Refer to Figures T a to d) As shown in Figures 7e and 7d, if one point of the wire rod 5 is pressed into the notch 1 of the veneer with one press-fitting member 6 and press-fitted, the wire rod 5
protrudes in a substantially V-shape, and the width l of the wire rod 5a at this protruding portion
Even if a considerable portion is caught and locked by the fibers of the veneer, as shown in FIG. It can be made to protrude in a substantially U-shape.

In this case, the fibers in the portion where the wire rod 5a is substantially locked by the fibers of the veneer are not destroyed by the press-fitting member 6, and the length l' of the wire rod 5a in the protruding portion is shortened in the thickness direction of the veneer S. It has the advantage of being able to take a long distance.

Furthermore, as described above, even if the cut 1 in the veneer S is wider than the diameter of the wire 5, the wire 5 can be press-fitted very easily by elastically deforming the wire 5 or the cut 1. Therefore, the wire rod 5a remains in the cut 1 as it is, and the veneer S and the wire rod 5 can be strongly connected.

Further, as shown in FIG. 9, regarding the tension of the wire 5a that protrudes excessively, when the wire 5 is press-fitted into the next notch 1a, an action occurs in which the wire 5 that was previously press-fitted into the notch 1 is pulled out in the direction of arrow a. As a result, the veneer can be engaged with the veneer one after another without any slack.

The results of experiments have confirmed that if a liquid such as water is supplied at the same time when the wire 5 is press-fitted, the notch 1 becomes completely sealed and the wire can be securely locked.

Further, the press-fitting member 6 is connected to the pitch of the notch 1 by a cam or other reciprocating mechanism (not shown) so that the wire rod 5 is press-fitted into the notch 1 in synchronization with the arrival of the notch 1 of the veneer S. Alternatively, as shown in FIG. 10, a press-fitting member 6 is provided on the circumferential surface of the rotary body 7 at the same pitch as the pitch of the cut 1 (the pitch of the stabbing blade 2), and the rotary blade 3 is Timing belt or
By connecting and arranging them using a transmission member 8 such as a chain, the notch and the press-fitting of the wire rod 5 can be performed in close proximity, and extremely stable reinforcement can be performed with less positional deviation.

FIG. 11 shows an embodiment of a method for manufacturing a reinforced veneer in the process of cutting veneer lace. On the upper side of the veneer knife 9, from the surface of the log 10, as much as possible, the thickness of the cut veneer S is at least t.
For example, by using a cutting member A such as a rotary knife 3 having a stabbing blade 2 on its outer periphery, sealed cuts 1 are formed by cutting fibers to an appropriate length at arbitrary intervals in the same direction as the rotational direction of the log 10. .

Further, on the rake face of the veneer knife 9, a press-fitting member 6 is provided so as to be rotatable at the same pinch as the pitch of the cutting body 7 into the circumferential surface of the rotating body 7.

Reference numeral 8 denotes a transmission member that rotates the press-fitting member 6 and the cutting member A in synchronization, and has a structure that follows the force input driven by a motor (not shown) or the rotation of the log 10.

Reference numeral 11 denotes a veneer guide placed on the rake surface of the veneer knife 9, and a groove 11a is formed in the rotating portion of the veneer guide 11 so that the press-fitting member 6 completely penetrates the veneer S from one surface to the other. form.

The above explanation shows the basic configuration for press-fitting the wire rod 5 into the cut 1 formed in the veneer in the cutting process of veneer lace, and the concrete configuration for press-fitting the wire rod 5 into the cut 1 using the press-fitting member 6. The operation, implementation, or some design changes are the same as those of the previously described embodiments, and therefore will not be described here.

Since the present invention has the above configuration, its effects are summarized as follows.

Unlike the conventional method, the fibers of the veneer are continuously cut, and since the fibers are cut at predetermined intervals in the direction perpendicular to the fiber direction, there is almost no effect on the strength of the veneer.

Since the wire rod is hooked onto the fibers in the cuts made in the veneer, the strength of the veneer fibers becomes the reinforcement strength, and compared to reinforcing methods that use adhesives, it is a method that is cheaper and has much higher reinforcement strength. You can get a board.

In particular, when it comes to raw veneers, it is common for conventional means to not immediately achieve adhesive strength, that is, to bond the wire rod and veneer with the adhesive, resulting in an unstable state for a long time, but the method of the present invention According to this, reinforcement strength is generated immediately.

Since the veneer and the wire can be engaged even during the cutting process with the veneer lace, the veneer to be discharged will not have more cracks, and the number of cutting points will be reduced accordingly, improving the yield.

Also, since it is reinforced with wire, it is easy to reel, and a large number of one-piece veneers can be obtained, making it easier to handle and improving the quality of the product.

Forming a closed cut in a veneer is easy and simple to perform.

As described above, the present invention has a significant effect and contributes to improvement of the veneer processing process.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is an explanatory diagram of a veneer reinforced with a wire rod, FIG. 2 is an explanatory cross-sectional diagram of the veneer reinforced by press-fitting a wire rod into the notch, and FIGS. Figure 4 is an explanatory diagram of forming a notch in a veneer, Figures 5a and b are cross-sectional diagrams showing the state of the notch, and Figure 6 is a diagram showing how the wire is protruded into the notch of the veneer and the size of the notch and the wire. 7a, b, c, and d are explanatory diagrams showing the relationship. Figure 7 is an explanatory diagram of the process of press-fitting a part of the wire into the notch of the veneer. Figure 8 is an embodiment diagram of press-fitting the wire. Figure 9 is FIGS. 10 and 11 are explanatory diagrams showing a wire being tensioned against a veneer, and FIGS. 10 and 11 are diagrams illustrating preferred implementation of the method of the present invention. S...Single board, 1...Notch, 2...
Curved piercing blade, 3...Rotating blade, 4...Knife, A...Cutting member, 5...Wire rod,
5a... Wire rod of protruding part, 6. Bent/press-fitting member,
7...Rotating body, 8...Transmission member, 9.
Song: Plywood knife, 10... Log, 11...
...Single plate guide.

Claims (1)

[Scope of Claims] 1. A cutting member such as a knife is passed through the veneer in the thickness direction, and the fibers are cut to an appropriate length to form a sealed cut.
The continuous wire is formed at arbitrary intervals in a direction substantially orthogonal to the fiber direction of the veneer, and then a part of the continuous wire is press-fitted into the cut with a press-fitting member, and a portion of the wire is inserted from one side of the veneer to the other. After the part is made to protrude in a V or U shape, the press-fitting member is pulled out, the protruding wire rod is hooked onto the veneer fiber in the cut, and the wire rod is engaged with the veneer in such a way that the cut is closed with the wire rod. 2. A method for producing a reinforced veneer, characterized in that the size of the cross section of the wire rod is larger than the gap between the notches formed in the veneer. 3. The method according to claim 1 or 2, wherein the wire is press-fitted into the notch in the veneer by pressing one point of the wire with a press-fitting member. 4. Method according to claim 1 or 2, which presses two or more points of the wire with a press-fitting member to press-fit the wire into the notch of the veneer.5 During the cutting process of the raw wood, the surface Then, in order to achieve a thickness greater than or equal to the set thickness of the cut veneer, sealing cuts are made in advance by cutting fibers to an appropriate length in the same direction as the rotation direction of the raw wood at arbitrary intervals using a cutting member such as a knife, and then sequentially. A part of the continuous wire rod is press-fitted with a press-fitting member into the cut that penetrates through the thickness direction of the veneer to be cut, and a part of the wire rod is inserted from one side of the veneer to the other side. After protruding in a U-shape, the press-fitting member is pulled out, the protruding wire rod is hooked to the veneer fiber in the cut, and the veneer and the wire are engaged during the cutting process in such a manner that the wire rod closes the cut. A method for manufacturing a reinforced veneer, characterized by: 6. The method according to claim 5, wherein at least the apparent cross-sectional size of the wire rod is larger than the gap between the cuts formed in the veneer. Square circle 8 according to claim 5 or 6, in which the wire is press-fitted into the veneer.Claim 8, in which the wire is press-fitted into the notch of the veneer by pressing two or more points of the wire with a press-fitting member. 9. The method according to claim 5 or 6, or 7 or 8, in which the wire is press-fitted into the notch of the veneer near the rake face of a plywood knife. too