JPH053962B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention involves applying an adhesive to the desired board surface while transporting a veneer veneer whose ends have been cut into symmetrical scarf slopes in the direction of the fibers. A veneer laminated material that is laminated and bonded in a continuous stair-like staggered manner, so-called
This invention relates to an improvement in the scarf cutting method used in the manufacturing process of laminated veneer materials commonly known as LVL (laminated veneer lumber) or LVB (laminated veneer board).

[Conventional technology]

Conventional techniques for cutting veneer veneer scarves into symmetrical scarf slopes on both ends are disclosed in, for example, Utility Model Application No. 62-185002 and Utility Model Application No. 64-
32101, Japanese Utility Model Application No. 64-34206, etc., both ends of the veneer veneer 11 are symmetrical, as shown in FIG. Cutting into a scarf slope,
A rotary cutting member 12 consisting of a cutter head 12a, a motor 12b, a sliding bearing 12c , a reciprocating mechanism 12d, etc., a fixed member 13a, a movable member 13b,
Pressing mechanism 13 consisting of air cylinder 13c etc.
The cutter head 12a is supported by a sliding bearing 12c for linear movement and reciprocates in a linear manner by a veneer single plate scarf processing device whose main part is formed on one side by an anvil member 14 etc. A so-called plain scarf cutting method, in which the sloped surface of the scarf is cut into a flat surface, is conventionally known.

[Problems to be Solved by the Invention] The plain scarf cutting method according to the above-mentioned prior art has the cutter head 12a supported by a sliding bearing 12c for linear motion and performs cutting by linearly reciprocating. The scarf slope formed by this process is said to be flat, but
In reality, there is usually a slight difference in level between the pressing mechanism 13 and the anvil member 14 (anvil member 14).
Due to the relief of the veneer veneer 11 during the cutting process due to the small space formed by 4), the scarf slope is not necessarily formed flat, but is formed into a somewhat medium-high scarf slope. As a result, high-density areas appear in the scarf area of the veneer laminated material, which is made by overlapping the scarf slopes and bonding them together.
In order to eliminate the serious problem of causing paint spots and unevenness in high-density areas when pasting decorative thin sheets etc. during secondary processing, the present invention has developed a cutter head that constitutes a rotary cutting member to be shaped like a pendulum. The purpose is to eliminate the appearance of high-density scarf parts by swinging the scarf and cutting along the locus of the scarf slope which is somewhat hollow.

[Means to solve the problem]

In order to achieve the above object, the present invention separately supports rotary cutting members so as to be swingable in the fiber direction directly above and directly below the ends of the veneer veneer, which are the processing locations for scarf cutting. By swinging the scarf in the direction of the fibers in a pendulum-like manner, the slope of the scarf is cut along a somewhat concave locus during the cutting process.

In addition, the swing radius of the rotary cutting member at this time is set to 20 to 60 times the thickness of the veneer veneer, so that the amount of depression in the center of the cutting trajectory can be adjusted. The slope of the scarf to be cut is 4 to 12 times the thickness of the veneer veneer, and the amount of overlap can be adjusted.

[Effect]

Since the present invention is configured as described above, the swing radius of the rotary cutting member is 20 to 20 times the thickness of the veneer veneer.
60 times, and the scarf slope is 4 to 12 times the thickness of the veneer veneer.The rotary cutting member is placed directly above and directly below the edges of the veneer veneer, where scarf cutting will be performed, respectively. According to a scarf cutting method in which the scarf is supported on a shaft so as to be swingable and is oscillated in the direction of the fibers in a pendulum-like manner by a reciprocating mechanism attached to the rotary cutting member, a desired overlapping amount can be achieved by, for example, 20
During the cutting process, the scarf slope formed with an overlapping amount of about mm is reduced to a somewhat desired amount of medium depression.
For example, when the relief when cutting a plywood veneer is thought to be about 0.2 mm, it is offset by cutting with a locus of the same amount of medium depression, so there is actually a medium height phenomenon in cutting the scarf slope. It does not occur. Therefore, when the upward scarf slope cut on the rear end of the preceding veneer and the downward scarf slope cut on the front end of the succeeding veneer are stacked vertically together and laminated and bonded. In addition, high-density areas no longer appeared in the scarf area.

〔Example〕

An embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. A cutter head 2a, a motor 2b, a machine frame 2c, and a support are used to cut both ends 1a and 1b of a veneer veneer 1 into a symmetrical scarf slope S. A veneer unit whose main parts are composed of a rotary cutting member 2 consisting of a shaft 2d, a reciprocating mechanism 2e, etc., a pressing mechanism 3 consisting of a fixed member 3a, a movable member 3b, an air cylinder 3c, etc., and an anvil 4 etc. A board scarf processing device is installed directly above and directly below the ends 1a and 1b of the veneer veneer 1, which is the processing location for scarf cutting, and its swing radius r is 20 to 60 times the board thickness t. The machine frame 2c of the rotary cutting member 2 is individually supported by the support shaft 2d so that S is 4 to 12 times the plate thickness t, and the rotary cutting member 2
By swinging the reciprocating mechanism 2e attached to the machine frame 2c in a pendulum-like manner in the fiber direction, the scarf slope S is formed to a desired overlap amount, for example, about 20 mm, as indicated by the broken line. The cutting process is performed to make a desired amount of recess with respect to the straight line indicated by, for example, a locus of a recess of about 0.2 mm, so as to offset the relief of the veneer veneer.

Also, the cutter head 2a of the rotary cutting member 2
The cutter head 2a generally consists of a planer, a grinder, etc., and its reciprocating mechanism 2e includes a geared motor or the like equipped with a crank mechanism, and its anvil member 4 is made of a soft synthetic resin plate or the like. The anvil member 4 is mounted so that it can be screwed freely, and is configured to gradually replenish the amount of wear.

〔Effect of the invention〕

Since the present invention is constructed as described above, it is possible to prevent the mid-height phenomenon of the scarf slope caused by the escape of the veneer veneer between the pressing mechanism and the anvil member during normal scarf cutting. In order to offset the cutting process by cutting along the trajectory of the slightly concave scarf slope during the cutting process, rotary cutting machines are supported directly above and directly below the edges of the veneer veneer, where the scarf cutting will be performed. By swinging the member in a pendulum-like manner in the direction of the fibers, it is possible to prevent high-density areas from appearing in the scarf area of the laminated veneer material, which is laminated and bonded by overlapping the scarf slopes of each other. According to the present invention, it is possible to completely eliminate the occurrence of paint spots and unevenness in high-density areas when attaching decorative thin sheets during secondary processing, and the implementation effect is extremely significant.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the cutting mode of a scarf slope of a veneer veneer, Fig. 2 is a side view showing one side of the main part of the scarf processing device, and Fig. 3 is a side view showing the main part of the conventional scarf processing device. It is a side view showing the side. 1...Plywood veneer, 1a, 1b...Both ends, 2
...Rotating cutting member, S...Scarf slope, r...
Swing radius, t...Plate thickness.

Claims (1)

[Scope of Claims] 1 A veneer veneer with both ends cut into symmetrical scarf slopes is conveyed in the direction of the fibers, and adhesive is applied to the desired board surface to stack and bond in a continuous stair-like staggered manner. In the manufacturing process of laminated veneer material, veneer veneer 1 is the place where the scarf is cut.
It is characterized in that the rotary cutting members 2 supported directly above and directly below the wood ends 1a and 1b are swung pendulum-like in the direction of the fibers to perform cutting along the locus of a somewhat hollow scarf slope S. Scarf cutting method in the manufacturing process of laminated veneer material. 2 Set the swing radius r of the rotary cutting member 2 to the plywood veneer 1
2. The scarf cutting method according to claim 1, wherein the scarf cutting method is 20 to 60 times the plate thickness t. 3. The scarf cutting method according to claim 1, wherein the scarf slope S, which is cut by swinging the rotary cutting member 2, is 4 to 12 times the thickness t of the veneer veneer 1.