Woodworking – Wood bending press – Including bending roller
Patent
1989-06-19
1990-12-18
Bray, W. Donald
Woodworking
Wood bending press
Including bending roller
72 65, 72107, 72173, 144 2R, 144362, 100176, 156209, B25H 100
Patent
active
049779400
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND OBJECTS OF THE INVENTION
The present invention relates to an apparatus for straightening boards and the like by means of rollers arranged within a main frame, between which the boards are guided.
In a known bend-straightening apparatus (DE-PS 32 07 548) boards and, in particular, boards that have been separated from the sides of a side-dressed log by chipless cutting, and similar flat wood products, which have a curve about a transverse axis, are straightened out between rollers.
In many instances, however, boards and the like, particularly those that have been produced by chipless cutting methods, have a twist in addition to the curvature discussed above, which is to say that they turn or twist about their longitudinal axis. In many applications, this deformation precludes any subsequent, automated processing. This twist grows greater, the more the separator blade is inclined to the longitudinal axis of the log.
It is the task of the present invention to create an apparatus for straightening boards and the like, which makes it possible to remove the above-discussed twist from the boards permanently, in one process that is as simple as possible.
SUMMARY OF THE INVENTION
According to the present invention, this task has been solved in that a board guide channel that extends in the longitudinal direction of the apparatus, and which is twisted approximately about the longitudinal axis of the apparatus, is formed in that a plurality of pairs of rollers are arranged in tandem, these being pivotted in each instance about the longitudinal axis of the frame, relative to the preceding pair of rollers.
Immediately after they have been produced, the boards pass through the board guide channel that is so formed and which has a twist that is opposite to the twist in the boards. This means that as the boards pass through the apparatus they are subjected to a continuous twisting that is opposite to the direction of the twist already in them. Thus, the boards are straightened so that ultimately they are permanently flat.
Since the boards can pass through the board guide channel at a relatively high speed, this matches the operating speeds achieved in the chipless separation of the boards, which can also be very high. The apparatus according to the present invention can be incorporated after the apparatus used for the chipless separation of the boards, either immediately or with a bend-straightening apparatus interposed between them.
Another embodiment that lies within the context of the present invention foresees that two conveyor belts extend from one pair of inlet rollers to a pair of outlet rollers that are offset relative to the first pair; that the two opposing sides
of the conveyor belts, which are also twisted, form a board guide channel betwen themselves; and at least one of the conveyor belts is driven. The boards are guided totally and continuously by the conveyor belts.
A development of the concept of the present invention foresees that the pairs of rollers can be pivotted so that a greater twist can be imparted to the board guide channel, so as to adapt it to operating requirements.
Most expediently, the lower roller of each pair of rollers, or the rollers that guide the lower conveyor belt, can be swung or folded down, so that fragments of wood, which can fall, for example, in the event of an imperfect log, can be removed easily from the apparatus.
The concept of the present invention foresees that the two rollers that make up each pair of rollers can be adjusted relative to each other so as to permit them to be adapted to boards of various thicknesses.
THE DRAWINGS
The invention is described in greater detail below, on the basis of embodiments shown in the drawings appended hereto. These drawings show the following:
FIG. 1: A simplified representation of an apparatus to straighten boards, this being in side view and in partial longitudinal cross-section;
FIG. 2: A cross-section on the line II--II in FIG. 1;
FIG. 3: A view as in FIG. 2, with the lower roller swung down;
FIG. 4: A simplif
REFERENCES:
patent: 1772139 (1930-08-01), Hessenbruch
patent: 2574248 (1951-11-01), Crowson
patent: 2973793 (1961-03-01), Irvine
patent: 3722562 (1973-03-01), Stegmuller
patent: 4139467 (1979-02-01), Etzolo
Braun Heinz-Hubert
Gonner Sigmar
Bray W. Donald
Gebruder Linck Maschinenfabrik "Gatterlinck" GmbH & Co. KG
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