Woodworking – Process – Repairing or reconstructing
Patent
1997-08-06
1999-02-02
Bray, W. Donald
Woodworking
Process
Repairing or reconstructing
144 2416, B27G 100
Patent
active
058652310
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for patching plywood or the like by removing a defective portion from a plywood board with a linearly moveable punch means arranged above the board and having a blade edge, and by cutting a patch from a patch board and placing the patch at that point of the plywood board from which the defective portion has been removed.
The invention also relates to an apparatus for patching plywood or the like, the apparatus comprising a linearly moveable punch means arranged above the board and having a blade edge, the apparatus further comprising means for making the punch means move linearly through the plywood board against a counter plate below the plywood board in order to remove a defective portion from the plywood board, and the apparatus further comprising a feed space into which a patch board from which the necessary patch will be cut is fed.
The present invention is especially well-suited for patching veneer, but it is also useful for other applications.
In the prior art methods and apparatuses, the apparatus comprises a double jaw structure with a blade in each jaw, the plywood board to be patched being placed between the blades. The defective portion is removed with the upper blade, and the patch is formed and put in place from below with the lower blade, while the upper blade functions as a counterpart. The known apparatuses are very large, weighing several tonnes, since in the known solutions, a large mass is needed to ensure accuracy. The apparatuses cannot be moved, but a human being is needed to move the plywood boards in relation to the apparatus. These apparatuses are difficult to automate. The prior art also discloses apparatuses with a rotary cutting blade for removal of a defective portion and with a separate pressing means or the like for putting an earlier formed patch in place. The fact that different means arranged in different places are used impairs accuracy, slows the operation, makes the apparatus more complicated in structure and adds to the expenses.
Further, FI 72,072 teaches a method and apparatus in which an upper blade is used for cutting a patch, but in some embodiments known from the reference the blade cuts the patch before the defective portion has even been removed, since the patch board is above the plywood board below the blade, like the plywood board. In some embodiments described in the reference, the patch board is below the plywood board to be patched, and a hoist is arranged below it to lift the patch to the proper place. The necessary operations, i.e. removal of a defective portion, cutting of a patch and putting it in place, are not performed in the above order, and therefore we consider the order less than ideal. In the above solution, the blade surrounds the patch when the patch is placed in the opening punched in the plywood board. To our understanding, a patch attached with an apparatus of the type described above is not secured firmly, since the blade surrounds the patch when it is put in place, and so the blade will have to be raised from around the patch once the patch is in place.
The object of the present invention is to provide a new kind of method and apparatus in which the problems involved in the prior art solutions are avoided.
The object is achieved by a method according to the invention, which is characterized in that the patch is cut from the patch board and the patch is inserted into the plywood board with the same linearly moveable punch means arranged above the board with which the defective portion has been removed from the plywood board a moment earlier, and that in the removal of the defective portion, the punch means is pressed downward through the plywood board against a counter plate arranged below the plywood board, that the punch means is raised, that the patch plate is placed below the punch means, that a patch is cut from the patch board with the punch means by moving the punch means linearly downward, and that the patch is inserted into the plywood plate by a further linear downward movement of the punch me
REFERENCES:
patent: 2663332 (1953-12-01), Peterson
patent: 2936802 (1960-05-01), Skoog
patent: 4388956 (1983-06-01), Hasegawa
Kauranen Erkki
Korhonen Markku
Luukkonen Aarno
Bray W. Donald
Mecano Group Oy
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