JPS6028564Y2 - Curling machine for veneer veneer - Google Patents

Description

[Detailed description of the invention] (Purpose of the invention) This invention aims to straighten the curl of a veneer veneer, which is largely curled on the front side due to back cracks caused by cutting and discharged by a veneer lace, to almost flat. It relates to a straightening machine, and its purpose is to treat veneer, which is seen as a similar device to conventional curl straightening machines, such as the veneer tenderizing method started in Tokusho No. 56-80402. Like a tenderizing device that presses and bends a veneer to create cracks and soften it, it has a convex part with a trapezoidal acute angle part like the tip of a normal gear, and a concave part with a wide space part of an inverted trapezoid. There was a device similar to the curl straightening machine that made the plywood flexible by inserting a veneer veneer between two gear-like rotating bodies facing each other vertically and making fine cracks alternately on the front and back surfaces. In a device of the same type, a veneer veneer is inserted between a pair of upper and lower gear-like rotating bodies consisting of a convex portion having a trapezoidal acute angle portion and a concave portion having a wide space portion having an inverted trapezoidal shape. When cracks are created on the front and back sides of the veneer, large cracks are created in one point in the material of the veneer due to the sharp angle of the convex part and the wide space of the concave part, which is not ideal. In order to eliminate the serious difficulty in the bending mechanism, which made it difficult in practice to generate many short cracks that do not extend significantly in the fiber direction, A plurality of curl straightening machines each consisting of a pair of upper and lower torsion pressing rollers each having a convex portion and a rounded concave portion with a relatively large radius of curvature concentrically opposed to the concave portion are installed in series. This problem was overcome by making the torsion directions of the convex portion and the concave portion intersect with each other.

(Structure of the device) The device has a structure in which rounded convex portions 2a, 2b with a small radius of curvature and rounded concave portions 3a, 3b with a large radius of curvature are twisted in the axial direction at equal pitches on the outer periphery of the rollers 1a, lb. A plurality of curl straightening machines 9A in which a pair of upper and lower torsion pressing rollers 4a and 4b are opposed to each other so that upper and lower convex portions 2 at 2 b and concave portions 3a and 3b are concentrically engaged;
9B, and the convex portions 2a of the plurality of curl straighteners 9A, 9B.

This machine is a veneer veneer curl straightening machine in which the torsional directions of the veneer 2b and the recesses 3a and 3b are crossed in series, and an example of the actual turning will be described below with reference to the drawings.

That is, the present invention is a torsion pressing roller of a curl straightening machine 9A, 9B in which two veneer veneers 6, which are conveyed by an incoming conveyor 5 and are greatly curled on the front side facing downward or upward due to cracks during cutting, are arranged in series. A guide conveyor 71 is continuously wound between 4a and 4b. 7b, this is fed between the two sets of torsion press rollers 4a, 4b, and the two sets of torsion press rollers 4a, 4b are rounded with a small radius of curvature, for example, a radius of 1.5 to 2 m/m. Cutting is particularly facilitated by the pressing and bending action caused by the concentric engagement of the convex portions 2a, 2b with a small radius of curvature and the rounded concave portions 3at3b with a radius of 4 to 5 m, or 7 m. New surface cracks Sl and S2 are created in the material on the front side of the veneer veneer 6 that was not cracked at the time, first the surface crack Sl is inserted diagonally, and then the surface crack S2 crosses the first surface crack Sl and diagonally. By inserting the veneer lace finely, the curl caused by the back cracking during cutting of the veneer lace is corrected to a substantially flat end, and the veneer lace is safely delivered onto the carry-out conveyor 8.

(Effect of the invention) As described above, the present invention has a rounded convex portion 2at2b with a relatively small radius of curvature, and a rounded convex portion with a relatively large radius of curvature that is concentrically opposed to the convex portions 2a and 2b. Concave portion 3a with
, 3b, a pair of upper and lower torsion pressing rollers 4a, 4
This is a veneer veneer single plate curl straightening machine, which is configured such that a plurality of curl straightening machines 9A and 9B consisting of 9A and 9B are arranged in series so that the torsion directions of the convex portions 2at2b and the concave portions 3a and 3b intersect. Therefore, the pressing and bending action of the two torsion pressing rollers 4a and 4b on the veneer veneer 6 is cushioning and does not concentrate the pressing and bending stress on one point, and the cracks intersect and do not extend significantly in the fiber direction. It is capable of making many short cracks, and has a push-bending action using a gear-like rotating body consisting of a convex part with a trapezoidal acute angle part and a concave part with an inverted trapezoidal wide space part, unlike conventional similar devices. In this way, large cracks were concentrated in one point in the material of the veneer veneer, and the yield rate of wide products after straightening was extremely low, resulting in low yield and quality. This is an extremely remarkable device with a real rotation effect that was able to eliminate the problem.

[Brief explanation of drawings]

The figures show one row of the present invention; FIG. 1 is a side view of the whole, FIG. 2 is a plan view, FIG. 3 is an enlarged side view of the main part, and FIG. It is a developed view of cracks caused by a pressure roller. la, lb...Roller, 2a, 2b...
...Convex portion, 3a, 3b...Concave portion, 4a, 4b・
...Torsion pressure roller, 6...Plywood veneer, 9A, 9B...Curl straightening machine.

Claims (1)

[Scope of utility model registration request] A pair of upper and lower torsion press rollers are formed by twisting a rounded convex part with a small radius of curvature and a rounded concave part with a large radius of curvature in the axial direction at an equal pitch on the outer circumference of the roller. and a plurality of curl straighteners facing each other so that the concave portions and concave portions engage concentrically, and are characterized in that the curl straighteners are arranged in series so that the torsion directions of the convex portions and the concave portions of the plurality of curl straighteners intersect. Curl straightening machine for veneer veneer.