JPH0112642B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a veneer veneer in which grooves are formed on both the front and back surfaces, and its purpose is to form kerfs on both the front and back surfaces of the veneer veneer ( This is done at the same time or almost simultaneously with the cutting of the veneer (hereinafter referred to as veneer), thereby improving work efficiency and saving labor in the process.

Therefore, it has been conventional practice to cut grooves on both the front and back sides of a veneer to be used as a core board for decorative plywood or hollow plywood. The only way to do this was to draw half-rules on the carved veneer. However, when performing half-rule on a veneer in this way, an auxiliary work is required to guide the veneer to a predetermined position, and in the case of a veneer that exhibits a curled state, it is necessary to perform half-rule on the veneer. It is also necessary to stretch the curls when pulling. Furthermore, there were also drawbacks such as the position of the cut being shifted due to the bending of the veneer, and the depth of the cut becoming inaccurate.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and includes a front line that is used to cut the surface of the veneer immediately after cutting on the outer circumferential surface of the raw wood or near the cutting part during the process of cutting the raw wood using a veneer lace. A pulling knife and a back-scoring knife that cuts into the back surface of the veneer immediately after cutting near the arcuate cutting virtual surface of the raw wood or the cutting part are operated to cut to a depth equal to or less than the thickness of the veneer to be cut. , the object is to immediately obtain a veneer having grooves on both the front and back sides from logs.

Here, the arcuate cutting virtual surface refers to the cutting surface parallel to the outer circumferential surface of the log that is expected to be cut with a cutting tool, and the vicinity of the cutting portion refers to the cutting surface that is parallel to the outer peripheral surface of the log that is expected to be cut with the cutting tool. More specifically, it refers to the position near the cutting edge of the cutting tool or on the holding member of the cutting tool, and below the cutting edge on the discharge side of the veneer.

The present invention will be explained based on the illustrated embodiments as follows.

Figure 1 shows the state in which raw wood is cut.A
1 shows a log whose both end faces are held by veneer lace chucks (not shown), 1 is a log-cutting knife held in a tool rest 4, and 2 is a log pointing inward from the outer circumferential surface of the log A. 3 is a front creasing knife that makes a cut in the raw wood cutting tool 1 at a predetermined interval in the longitudinal direction, and a back creasing knife B that makes a cut in the arcuate cutting virtual surface b of the raw wood A;
indicates the veneer cut out by the cutting blade 1, and a indicates the rotation direction of the log A, respectively.

As shown in FIGS. 1 and 2, the blade edges of the front creasing knife 2 and the back creasing knife 3 are located on the upper side in the direction of rotation of the log A than the cutting edge of the log cutting knife 1, and are located on the upper side in the rotational direction of the log A, and as shown in FIGS. and arranged so that the cut into the log A of the front creasing knife 2 and the back creasing knife 3 is less than or equal to the thickness of the veneer B to be cut, as shown in FIG. do.

Furthermore, as illustrated in FIG. 2, the front creasing knife 2 and the back creasing knife 3 are spaced at predetermined intervals in the longitudinal direction of the log cutting knife 1 according to the position of the kerf to be formed in the veneer. Place an appropriate number of each.

The arrangement of the front scoring knife 2 and the back scoring knife 3 in the longitudinal direction of the log cutting knife 1 is appropriately set according to the arrangement of the kerfs to be formed on both the front and back surfaces of the veneer B to be cut. For example, as shown in FIG. 3, two front-scoring knives 2 and two back-scoring knives 3 may be arranged alternately.

As illustrated in FIG. 2, the back-scoring knife 3 is held in a state in which the blade is sandwiched between the blocks of the log-cutting knife 1, which are divided into blocks. Although it is desirable, for example, by drilling a groove in the raw wood cutting blade 1 (not shown),
The back-scoring knife 3 is interposed in the log-cutting knife by an appropriate means, such as detachably attaching the back-scoring knife 3 to the groove, or forming the back-scoring knife integrally with the log-cutting knife. All you have to do is configure it into a state. In that case, the cutting edge of the back-scoring knife is
It is provided in the opposite direction to the rotation direction of the log.

In some cases, the cutting edges of both creasing tools 2 and 3 may also be positioned somewhat rearward than the cutting edge of the cutting tool 1 for cutting logs, so as to score the veneer immediately after cutting. However, they may be combined as appropriate.

In the veneer lace configured as described above, since the front creasing knife 2 and the back creasing knife 3 are provided, as shown in FIG. , since the front creasing knife 2 cuts inward from the outer circumferential surface of the log A, and the back creasing knife 3 cuts outward from the arcuate cutting virtual surface of the log A to be cut with the log cutting knife 1, the log In this state, the kerf is inserted, and when the log A is cut with the log cutting blade 1, the veneer B having the kerf on both the front and back surfaces can be cut out almost at the same time. FIG. 4 shows a state in which grooves 2a and 3a have been formed on both the front and back surfaces of the veneer B by the above-described method.

Further, as illustrated in FIGS. 5 and 6, if a thread inserting mechanism is provided in the front creasing knife 2, and a wire material 5 such as a thread is embedded in the cutting groove at the same time as cutting into the raw wood. As shown in FIG. 7, wire rods 5 such as threads are embedded in the cut grooves 2a of the veneer B, so that the veneer B can be reinforced very effectively and appropriately.

In the embodiment described above, the front creasing knife 2 and the back creasing knife 3 are operated in front (on the upper side) of the log cutting knife 1, but the cutting made by the log cutting knife 1 is It is also possible to apply both of the creasing cutters 2 and 3 to the front and back surfaces of the veneer B immediately after.

According to the method of the present invention, half-rules can be drawn during the cutting process of the raw wood as described above.
Unlike when half-marking a veneer in the next or post-process, there are no disadvantages such as the position of the cut being shifted due to bending of the veneer, or the depth of the cut being inconsistent, making it possible to cut accurately. This allows continuous production of grooved veneers.

Next, a case will be described in which a veneer B having cut grooves 2a and 3a cut out from raw wood by the method of the present invention is used as a core board of plywood.

First, the veneer B according to the present invention is cut into a fixed length so that the direction perpendicular to the fiber direction of the veneer has a predetermined length to create a large number of fixed-length sheet veneers C. Next, as shown in FIG. 8, the fiber direction end of another regular size sheet veneer C is overlapped with the fiber direction end of another regular length sheet veneer C by an appropriate length and bonded with adhesive or the like. Extend the required length in the fiber direction of the veneer. Then, as shown in FIG.
9 and 10.
The core plate C' is made of plywood as shown in the figure. Figure 9 shows an example of the case where the veneer joined in the fiber direction is bent into a wave shape and used as a core plate of hollow plywood, and Figure 10 shows the bending of the kerfs 2a and 3a. This is an example of a case in which the degree of folding is further increased so that the plate parts are folded in close contact with each other and used as a core board of plywood having no internal hollow part.

Further, when the front creasing knife 2 and the back creasing knife 3 are arranged in an arrangement as illustrated in FIG. 3, grooves 2a and 3a are formed as shown in FIG.
The veneer B in which the grooves have been formed in this manner can be used as a core plate C' of a hollow plywood as illustrated in FIG. 12 in the same manner as described above. In the figure, 6 indicates the upper plate, 7 indicates the lower plate, and C' indicates the core plate.

As described above, according to the present invention, the cutting grooves on both the front and back sides of the veneer can be formed at the same time or almost simultaneously with the cutting of the veneer with the veneer lace, so the various drawbacks of the conventional method can be solved very rationally. At the same time, it is possible to improve work efficiency and save labor in the process, making a great contribution to the plywood industry.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory diagram showing the cutting state of raw wood by the method of the present invention, and FIGS. 2 and 3 are a log cutting knife, a front scribing knife, and a back scoring An explanatory diagram illustrating the positional relationship with the cutlery,
Figures 4 and 11 are explanatory diagrams illustrating the state in which kerfs are formed on both the front and back surfaces of the cut veneer;
Figures 7 to 7 are explanatory diagrams showing an example in which a thread insertion mechanism is provided to a front creasing knife, and Figure 8 is an illustration of an example in which a veneer according to the manufacturing method of the present invention is used as a core board of plywood. Explanatory diagram illustrating the creation state, Fig. 9, Fig. 1
FIG. 0 and FIG. 12 are explanatory diagrams showing an example in which the veneer according to the manufacturing method of the present invention is used as a core board of plywood. A...Log wood, B...veneer, C...standard sheet veneer,
C'... core plate, 1... log cutting knife, 2... front creasing knife, 3... back creasing knife, 2a, 3a... cutting groove, 4...
turret, 5... wire rod such as thread, 6... upper plate, 7... lower plate,
a...Rotation direction of log A, b...Concave cutting virtual surface.

Claims (1)

[Claims] 1. In the cutting process of manufacturing veneer veneer from logs using veneer lace, a front creasing knife that cuts into the outer circumferential surface of the log or the surface of the veneer veneer immediately after cutting near the cutting part, and an arc-shaped virtual cutting surface of the log or A back-scoring knife that cuts into the back side of the veneer veneer immediately after cutting near the cutting part is used to cut to a depth that is less than the thickness of the veneer veneer to be cut, and cuts are made on both the front and back of the veneer veneer. A method for manufacturing a veneer veneer, comprising manufacturing a veneer veneer having grooves.