JPH0431842B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention is directed to cutting two types of thick and thin veneer veneers, each of which has been simultaneously cut into contrasting scarf slopes at the same angle, to the desired surface while conveying it in the fiber direction. A veneer laminate material that is applied with adhesive and then laminated and bonded in a continuous stair-like staggered manner, commonly known as LVL (laminated veneer lumber) or LVB (laminated veneer board). The present invention relates to an improved scarf cutting method for thick and thin veneer veneers used in the manufacturing process of wood.

(b) Prior art A method for cutting a scarf of a veneer veneer using the prior art in which both ends are simultaneously cut into contrasting scarf slopes at the same angle includes, for example, a veneer veneer scarf processing apparatus No. 185002/1983. has been disclosed. a conveyor for conveying the processed veneer in the fiber direction; a front edge stopper mechanism for the processed veneer installed in the vicinity of the unloading section of the conveyor so as to be movable up and down;
A rotary cutting member for scarfing the front edge of the veneer to be processed, which is installed in the vicinity of the contact portion of the front edge stopper mechanism so as to be able to reciprocate diagonally upward from directly below the conveyor; A rotation for scarfing the trailing edge of the workpiece veneer, which is reciprocatably installed from directly above the conveyor at a position corresponding to the length of the workpiece veneer in the fiber direction to diagonally downward with respect to the rotary cutting member. A veneer veneer plate comprising a cutting member and a pressing mechanism for pressing the edge of the veneer to be processed, which is separately installed between the rows of the conveyor corresponding to the rotary cutting member for scarfing the front and rear edges. There is a method of scarf cutting a veneer veneer in which both ends of the scarf are simultaneously cut into contrasting scarf slopes at the same angle using a scarf processing device and then provided for the manufacturing process of a laminated veneer material.

(c) Problems to be Solved by the Invention The method for scarf cutting a veneer veneer disclosed in the above-mentioned conventional example is a single-function method in which a pair of rotary cutting members are fixedly or semi-fixedly opposed to each other in the conveying direction. Because the scarf processing equipment was used to simultaneously cut both sides of the ends into contrasting scarf slopes at the same angle and provide them as they were to the manufacturing process of veneer laminates, the total amount of veneer veneers with the same thickness was processed. It was possible to cut both the total length in the fiber direction of the scarf to the same size, as well as the remaining effective length in the fiber direction when the front and rear scarf slopes are overlapped, but it was possible to cut the entire length in the fiber direction to the same size. In some cases, it is possible to cut the entire length in the fiber direction to the same size, but in terms of the effective length in the fiber direction, thin veneer veneer is better than thick veneer veneer at the same angle. As the scarf slope is formed shorter by the cutting process, its effective length becomes longer than that of the thick veneer veneer. Therefore, the thin and thick veneer veneers are stacked in a continuous step-like manner. When assembling the front and back plates and the core plate, the stacking pitches are not equal in thickness and thickness, and in the case of the top plate, the position of the rear end of the thin veneer is behind the thick veneer of the core plate. If the end part gradually extends backward from the structural position and overlaps it, or in the case of the back plate, it protrudes significantly from the core plate, etc., resulting in a continuous stair-like staggered stacking under normal conditions. In order to avoid this situation, the conventional process for manufacturing veneer laminates by staggered stacking was based on the principle of applying veneer veneers of equal thickness throughout.

However, with the recent depletion of high-quality logs,
We use comparatively high-quality, inexpensive thin veneer veneer for the front and back plates that determine the final quality, and relatively low-quality, inexpensive, thick veneer veneer for the core plate that is hidden, allowing us to economically produce products with the desired quality. In view of the urgent need to establish a streamlined construction method that aims to achieve efficient production, the present invention has developed a system that allows the continuous stair-like staggered structure of two types of thick and thin veneer veneers to be put into the same process. It is constructed so that it can always be adjusted to the normal position.

(d) Means for solving the problem The present invention makes it possible to always adjust the position of the continuous stair-like staggered structure to the normal position even if the above-mentioned two types of thick and thin veneer veneers are put into the same process. , Two thick and thin veneer veneers, both ends of which are cut into contrasting scarf slopes at the same angle, are conveyed in the direction of the fibers, and adhesive is applied to the required surfaces, and then laminated and bonded in a continuous stair-like staggered manner. In the manufacturing process of laminated veneer materials, the total length of a thin veneer veneer in the fiber direction is compared to the total length of a thick veneer veneer in the fiber direction by the difference in length of the scarf slope on one side that is proportional to the thickness of the thin veneer veneer. This is a method of cutting scarves in the manufacturing process of laminated veneer material, which has been improved to cut short pieces.

(e) Effects To explain in detail the effects when the scarf cutting method of the present invention is applied to the scarf processing apparatus for veneer veneers disclosed in the conventional example, first, Two different thicknesses, e.g.
The veneer veneers of two thicknesses, 3.2 mm and 1.6 mm, are taken out separately from two types of piles according to the sequence programmed in advance into the computer of the transfer robot. Therefore, since the thickness of the veneer veneer has already been identified during the supply process,
When a 3.2 mm thick veneer veneer, which is normally used for the core board, arrives, it is cut in two to a predetermined total length in the fiber direction. The front and rear scarf slopes are overlapped by a scarf processing device equipped with a pair of rotating cutting members for processing the front edge scarf and a rotating cutting member for processing the rear edge scarf, which are arranged at intervals that can bisect the scarf. Cut both the front and rear ends of the scarf at once so that the remaining effective length in the fiber direction is 930 mm, which is obtained by subtracting the length of the scarf slope of 20 mm from the total length of 950 mm. Next, when a thin 1.6 mm veneer veneer is usually used for the front and back panels, the distance between the front edge scarfing rotary cutting member and the trailing edge scarfing rotary cutting member is changed to the thickness and thickness. The difference in the length of the scarf slope on one side is proportional to the thickness of the veneer veneer, for example, the length of the scarf slope of 20 mm on a thick 3.2 mm veneer and the thin 1.6 mm.
Plywood veneer 10mm scarf slope length thickness 10
In order to cut the total length in the fiber direction shorter by the difference of mm, the remaining effective length in the fiber direction when the front and rear scarf slopes are overlapped is also
In order to perform the same cutting process as when cutting a 3.2 mm veneer veneer, one of the pair of rotary cutting members for scarfing the front and rear edges is used, and normally the rotary cutting member for scarfing the trailing edge is cut at the front end. The mutual spacing is temporarily reduced from, for example, 950 mm to 940 mm by moving the rotary cutting member for edge scarf processing each time using a moving device such as a screw or an air cylinder.
When the 3.2 mm veneer veneer arrives again, the initial spacing is restored, for example, from 940 mm to 950 mm. Therefore, by inputting two types of veneer veneers, 3.2 mm and 1.6 mm thick and thin, into the same process, the total length in the direction of the fibers to be bisected will be different, for example.
Although they are cut to the dimensions of 950 mm and 940 mm, the remaining effective length in the fiber direction by overlapping the front and rear scarf slopes is cut to the same dimension, for example, 930 mm, so the continuous The position of the stair-like staggered stacking system will be adjusted to the normal position regardless of its thickness.

(F) Embodiment The embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG. 1 shows a scarf in which a pair of rotary cutting members for processing a front edge scarf and a rotary cutting member for processing a rear edge scarf are connected. A processing device simultaneously forms contrasting scarf slopes 1a and 1b at the same angle on both ends of the scarf.
Fig. 2 shows a perspective view of a veneer veneer 1 that has been cut into a shape, and Fig. 2 shows a structure in which thin veneer veneers 2a and 2b are stacked and stacked on the front and back plates, and a thick veneer veneer 3 is used as the core plate. This is a veneer laminate material 4 that uses a large number of staggered stacks of fibers, and arranges the fiber directions in parallel to form a continuous stair-like staggered stack.The veneer laminate material 4 is commonly called LVL.
In addition, for example, another cross-banding core plate whose fiber direction is orthogonal to each other to form a cross band may be inserted between the front and back plates and the core plate, or between the core plates to form a cross band. The method of the present invention can also be directly applied to laminated veneer laminated materials with cross bands, commonly known as LVB.

Therefore, when applied to the veneer laminate 4, the thin veneer veneers 2a, 2b and the thick veneer veneer 3 have contrasting scarf slope lengths S1, with both ends thereof having the same angle a, For S2, for example, the plate thickness is 4 to 8.
The lengths of the scarf slopes S1 and S2 are cut at the same time, and the fiber direction is bisected.
At that time, the remaining effective length K in the fiber direction when the front and rear scarf slopes are overlapped is the effective length of the same dimension obtained by subtracting the lengths S1 and S2 of each scarf slope from the total length l1 and l2 of each fiber direction. It is set to K. Therefore, even if two thick and thin veneer veneers are input into the same process, the pitch P of the continuous stair-like staggered stacking is, for example, about 4 to 8 times the thickness of the thick veneer 3. Once this pitch P is set, the regular pitch P will be maintained at any laminated portion. In order to set the effective lengths K of the thin veneer veneers 2a and 2b and the thick veneer veneer 3 to the same dimension,
When cutting the scarf on both ends, it is necessary to bisect the full lengths l1 and l2 into different lengths regularly for the respective board thicknesses t1 and t2. The veneer veneers 2a, 2 having two different thicknesses t1, t2;
The regular bisection of the total lengths l1 and l2 in the fiber direction of b and 3 is, as illustrated in FIG. is shorter by the mutual difference between the lengths S1 and S2 of the scarf slopes on one side, which are formed in proportion to the plate thicknesses t1 and t2 during scarf cutting, with respect to the total length l2, that is, by (S2-S1) in the fiber direction. In order to be able to cut scarves with short spacing between each other, for example, the spacing in the direction of conveyance of a pair of rotary cutting members for scarf processing on the front and rear edges, which are made up of cutter blocks, chipsaws, etc. facing each other at the front and rear of the scarf processing device, is set by adjusting the spacing in the direction of conveyance. This is done by arranging the length to be alternately adjustable to predetermined overall lengths l1 and l2 each time using a moving device such as a cylinder.

(g) Effects of the invention As described above, even if two types of thick and thin veneer veneers are put into the same process, the position of the step-like staggered stacking system can be adjusted to the normal position, and the thin veneer veneer can be adjusted to the normal position. A veneer in which the total length of the veneer in the fiber direction is cut short by the difference in length of the scarf slope on one side, which is proportional to the thickness of the thick veneer veneer. Since it is a scarf cutting method in the manufacturing process of laminated materials, it eliminates the quality and economic disadvantages when manufacturing veneer laminated materials by staggered stacking, which was limited to veneer veneers of equal thickness in the conventional process. Therefore, the front and back panels that determine the final quality can be made of relatively low-quality, inexpensive thin veneer veneer, and the core plate that is hidden can be made of relatively low-quality, inexpensive, thick veneer veneer. This method has established a streamlined construction method that enables the economical production of high-quality products, and the completion of the present invention has led to significant progress in the manufacturing process for laminated veneer materials.

[Brief explanation of drawings]

The figure shows an example of implementation of the present invention,
Figure 1 is a perspective view of a veneer veneer with both edges cut into contrasting scarf slopes, Figure 2 is a side view of the veneer laminate in the construction process, and Figure 3 is a veneer veneer with two different thicknesses. It is an explanatory view of scarf cutting. 1...Plywood veneer, 1a, 1b...Scarf slope, 2a, 2b...Thin veneer veneer, 3...Thick veneer veneer, 4...Veneer laminate, t1, t2...
Plate thickness, S1, S2... Length of scarf slope, l
1, l2...Full length.

Claims (1)

[Claims] 1 Two thick and thin veneer veneers, both ends of which are cut into contrasting scarf slopes at the same angle, are conveyed in the direction of the fibers while applying adhesive to the required surfaces and laminated and bonded in a continuous stair-like staggered manner. In the manufacturing process of laminated veneer materials, the total length in the fiber direction of a thin veneer veneer is compared to the total length in the fiber direction of a thick veneer veneer, and the difference in the length of the scarf slope on one side is proportional to the thickness of the thin veneer veneer. 1. A scarf cutting method in a manufacturing process of laminated veneer material, characterized in that the scarf is cut short and the position of a stair-like staggered structure is adjusted.