JPS6126004Y2 - - Google Patents

Description

[Detailed description of the invention] (Purpose of the invention) This invention is a veneer that straightens the veneer veneer, which is cut and discharged by the veneer lace and is curled greatly on the front side due to back cracks during cutting, to almost flat. It is related to a veneer curl straightening machine, and its purpose is seen as a similar device to conventional curl straightening machines of this kind, for example, in the method of tenderizing veneer veneer disclosed in Japanese Patent Application Laid-Open No. 56-80402. Like the disclosed tender licing device that presses and bends a veneer veneer to create cracks and soften it, a convex portion having a trapezoidal acute angle portion like the tip of a tooth of a normal gear;
A veneer veneer is inserted between vertically opposed gear-like rotating bodies consisting of concave parts with wide spaces in the form of inverted trapezoids, and fine cracks are made alternately on the front and back surfaces to make them flexible. There was a device similar to the curl straightening machine, but in this type of similar device, there is a pair of upper and lower gears consisting of a trapezoidal convex portion with an acute angle portion and a concave portion with an inverted trapezoidal wide space portion. When a veneer veneer is inserted between a rotating body and cracks are formed on the front and back sides, the cracks are concentrated 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. In addition, large cracks were created in the fibers, and the serious difficulty in the bending mechanism that made it difficult to achieve the ideal of producing many short cracks that did not extend significantly in the fiber direction was resolved. In order to wipe the area, a pair of upper and lower pressure rollers consisting of a rounded convex portion with a relatively small radius of curvature and a rounded concave portion with a relatively large radius of curvature concentrically facing the convex portion are used. This problem was overcome by arranging a plurality of curl straighteners in series and sequentially shifting the meshing phase between the convex portion and the concave portion.

(Structure of the invention) The present invention has rounded protrusions 2a, 2b with a small radius of curvature and rounded recesses 3a, 3b with a large radius of curvature on the outer periphery of the rollers 1a, 1b, which are elongated in the axial direction at equal pitches. The formed pair of upper and lower pressing rollers 4a, 4b are connected to the upper and lower convex portions 2a, 2b and the concave portion 3.
Consisting of a plurality of curl straightening machines 9A and 9B facing each other so that a and 3b engage concentrically, and convex portions 2a and 2b of the plurality of curl straightening machines 9A and 9B.
This is a veneer veneer curl straightening machine in which the meshing phase of the concave portions 3a and 3b is sequentially shifted so that they are connected in series, and an example of its implementation will be described below with reference to the drawings.

That is, the present invention is a press roller of a curl straightening machine 9A, 9B in which two veneer veneers 6, which are transported 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. The guide conveyor 7a, 7b continuously wound between the two sets of pressure rollers 4a, 4b sends it between the two sets of press rollers 4a, 4b, and the small radius of curvature of the two sets of press rollers 4a, 4b is ,
For example, a concentric circle of convex parts 2a, 2b with a rounded small radius of curvature of 1.5 to 2 m/m and concave parts 3a, 3b with a large radius of curvature, for example, a radius of 4 to 5 m/m. Due to the pushing and bending action caused by the close contact between the upper and lower parts, new surface cracks S ₁ and S 2 are created in the material on the front side of the veneer veneer 6 that did not crack during cutting, and _{the initial surface crack S 1 is} widened. put in,
Next, by narrowly inserting the front crack S ₂ between the first front crack S ₁ , the curl caused by the back crack during cutting of the veneer lace is corrected to be almost flat, and the surface crack S 2 is completely placed on the unloading conveyor 8. The device was designed to be delivered to.

(Effect of the invention) As described above, the present invention has rounded convex portions 2a and 2b with a relatively small radius of curvature, and a relatively large radius of curvature that is concentrically opposed to the convex portions 2a and 2b. A plurality of curl straighteners 9A and 9B each consisting of a pair of upper and lower pressing rollers 4a and 4b each having a rounded concave portion 3a and 3b are connected in series to form a convex portion 2.
Since this is a veneer veneer curl straightening machine configured to sequentially shift the meshing phase between a and 2b and the recesses 3a and 3b,
The pressing and bending action of the series of pressing rollers 4a and 4b is cushioning and does not concentrate the pressing and bending stress on one point, and breaks the cracks into small pieces at shifted locations, and also creates a large number of short cracks that do not extend greatly in the fiber direction. It is possible to crack the veneer by pushing and bending the veneer 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 as in conventional similar devices. We were able to eliminate all the drawbacks of creating large cracks in the material of the veneer at one point, which made the yield rate of wide products after straightening extremely low, and the yield and quality also low. , it is a device with extremely remarkable implementation effects.

[Brief explanation of the drawing]

The figure shows an example of implementation of the present invention, and
FIG. 1 is a side view of the whole, FIG. 2 is an enlarged side view of the main parts, and FIG. 3 is a developed view of cracks caused by two press rollers. 1a, 1b...Roller, 2a, 2b...Convex portion, 3a, 3b...Concave portion, 4a, 4b...Press roller, 6...Plywood veneer, 9A, 9B...Curl straightening machine.

Claims (1)

[Scope of utility model registration request] A pair of upper and lower pressing rollers, each of which has a rounded convex part with a small radius of curvature and a rounded concave part with a large radius of curvature, are formed elongated in the axial direction at equal pitches on the outer circumference of the roller. A veneer veneer comprising a plurality of curl straightening machines facing each other so as to mesh concentrically, and the plurality of curl straightening machines are arranged in series with the meshing phase of the convex portion and the concave portion being sequentially shifted. Curl straightening machine.