JPS5845046Y2 - Veneer straightening machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a veneer veneer straightening machine that straightens a veneer veneer which is cut and discharged by a veneer lace and which has been greatly curled on the front side due to back cracking during cutting into a substantially flat shape.

As a conventional device, a pair of rubber rolls each having a large number of diagonal grooves on the outer periphery, which are diagonal to each other at the contact surface, are installed in parallel, such as the device for preventing and removing wavy deformation of veneer plate No. 1983-02274. There is a system that uses a pair of rubber rolls to compress and convey the veneer, but with this structure, the veneer is conveyed while being pressed by the peaks of the pair of rubber rolls, so the rubber wears quickly and the straightening function is long. There is a problem that it does not last for a long time, and the change in diameter of the rubber roll that occurs when the rubber roll is pressurized, that is, the change in circumferential speed, is used to spread the veneer veneer like a squid and correct the curl. Due to the nature of the material, areas that are easy to spread due to the material are spread more than necessary, and areas that are difficult to spread are not spread at all, which is a serious defect that causes unevenness in the curl correction effect.

The present invention completely eliminates the above-mentioned problems of the conventional device in which the corrective function does not last for a long period of time and the serious defects in which the corrective action is uneven. It is as follows.

First, the curled veneer veneer 2 conveyed by the carry-in conveyor 1 is carried into a veneer straightening machine 3 connected to the carry-in conveyor 1.

The veneer straightening machine 3 includes a pair of upper and lower torsion pressing rollers 3A, 3A' in which pressing projection members 3b, 3b' are formed in a twisted shape on the outer periphery of the rollers 3a, 3a'.
The torsional pressure rollers 3A, 3A' are, for example, metal rollers 3a, 3a' with projection members 3b, 3b' made of small-diameter round metal rods welded to the outer periphery of the metal rollers 3a, 3a' in a twisted state, In addition, the protruding members 3 b and 3 b' are configured to sandwich the veneer veneer 2 between them and rotate them integrally while facing each other in a vertically interlocking phase relationship.

Therefore, the veneer veneer 2 brought in here is torsioned by the protruding members 3 b , 3 b on the outer periphery of the pressing rollers 3 A, 3 A'.
', the protruding member 3 is pressed and bent in a waveform with a small radius of curvature alternately upward and downward while being conveyed.
Fine surface cracks 2a occur on the front side of the veneer veneer 2 due to the pushing and bending action of b and 3b', and the large curl caused by the previous back crack is offset by these fine surface cracks 2a, resulting in an approximately flat surface overall. It is corrected to a proper posture.

In addition, since the protruding members 3 b and 3 b' are twisted left and right, the protruding members 3 b and 3 b'
As illustrated in Fig. 1, the pushing and bending action due to b' differs in phase at each location perpendicular to the conveying direction. It is in a position to start pushing downward and bending, also as shown in Figure 1 B.
The roller 3A in the -B cross section is in a completely bent position from top to bottom, and the roller 3A in the C-C cross section in FIG.
Since the phase gradually changes to the position where the pushing and bending from top to bottom ends, the force point of the pushing and bending action that acts on the veneer veneer 2 is also in the axial direction of the rollers 3A and 3A' (X-
The projection member 3b is not concentrated on the − line of
, 3b' moves diagonally along the torsion angle, and the surface crack 2a is formed due to the pushing and bending action, so the torsion pushing and bending rollers 3A, 3A' rotate smoothly and the surface crack 2a is formed on the fibers. Since they are individually dispersed without being continuous in the direction, the straightening action of the veneer veneer 2 can be performed safely and reliably without the need for excessive power equipment or the risk of breaking the veneer veneer 2.

As mentioned above, the present invention includes a pair of upper and lower torsion pressure rollers 3A,
By rotating the protruding members 3b and 3b' of 3A' in a phase relationship such that they mesh with each other, it is possible to smoothly and safely form the surface crack 2a on the veneer veneer 2 and correct the initial curl. Because of this, it does not wear out like conventional devices that use rubber rolls, and can maintain its straightening function semi-permanently, and its straightening action is even, making it possible to straighten curls without unevenness. It has been effective.

In the figure, 4 is a guide belt wound around the upper roller 3A, and 5 is a delivery conveyor.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, in which FIG. 1 is a plan view, FIG. 2 is a side view, and FIG. 3 is a sectional view of each part of FIG. 1. 3 a, 3 a'...Roller, 3b, 3b
'... Protrusion member, 3A, 3A'... Twisting press roller, 3... Single plate straightening machine.

Claims (1)

[Scope of utility model registration request] A veneer straightening machine characterized by a pair of upper and lower torsion pressing rollers each having a pressing projection member formed in a twisted position on the outer periphery of the roller, facing each other in a phase relationship in which the projection members mesh with each other. .