Cutting – With means to guide moving work – Guide fixed to or integral with stationary tool element
Patent
1989-11-06
1992-06-23
Watts, Douglas D.
Cutting
With means to guide moving work
Guide fixed to or integral with stationary tool element
83430, 83444, 83446, 83495, 144178, B27B 2502, B27B 2506, B27B 534
Patent
active
051233193
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns circular saw for cutting wood such as tree trunks, blocks or squared wood with previously machined parallel side faces, with at least one circular saw blade mounted on a saw shaft.
Tree trunks, blocks or squared wood are cut by circular saw blades mounted on a saw shaft by longitudinal cuts into planks, boards or squared wood. The wood is guided by the associated transport and feeder mechanism and/or separate guiding element. The guiding accuracy affects not only the dimensional accuracy of the wooden work pieces produced, but also affects the potential lateral forces applied by the wood to the circular saw blades. The lower the lateral forces to be expected, the thinner the circular saw blades can be, which in turn leads to narrower saw gaps and thus to less loss of material due to sawing chips.
The guiding accuracy in the sawing zone decreases with the distance of the structural elements from the circular saws. It is therefore the object of the invention to design a circular saw of the aforementioned type so that the most accurate guidance of the wood in the sawing zone may be obtained with a low structural effort.
SUMMARY OF THE INVENTION
This object is attained according to the invention by that a supporting disk is mounted axially spaced apart from the circular saw blade on the saw shaft, said disk having a supporting surface on its frontal surface facing the circular saw blade, for the lateral surface of the three trunk, block or squared wood.
This supporting surface is located in the immediate vicinity of the circular saw blade and therefore provides a high guiding accuracy. The structural effort is low, because no separate guide element are needed, aside from the supporting disk. The axial forces acting on the supporting disk are absorbed directly by the saw shaft. The guidance of the wood becomes effective shortly after the onset of the saw cut and remains effective until after the cut is completed.
The supporting disks may be mounted fixedly on the saw shaft, so that they rotate at the rpm of the saw shaft. In order to further reduce the friction generated between the supporting surface and the wood, in a further development of the concept of the invention the support disks may be supported in a freely rotating manner on the shaft by means of a support bearing. The support disks then move with a peripheral velocity corresponding to the rate of advance of the wood, so that frictional forces will be at a minimum.
According to a particularly advantageous form of embodiment of the invention the support disk possesses a support ring axially protruding toward the wood surface to be supported, with the diameter of said support ring being approximately equal to the external diameter of the circular saw blade. The lateral support force is then applied to the wood adjacent the region cut by the saw teeth, i.e. at the location at which the side board being cut is still connected with the main piece of the wood. As preferably identical support disks are mounted on opposing sides of the tree trunk, the trunk is supported and guided at the location at which the saw cuts begin. In this manner relatively high lateral forces may be applied from both sides, without the risk of compressing an already existing saw gap between the boards, planks or squared woods.
According to the invention two opposing support disks may be mounted either on a common saw shaft on either side of the circular saw blade or a group of saw blades located adjacent to and spaced apart from each other, or a support disk each may be mounted on the hub of opposing circular saw heads.
A particularly advantageous form of embodiment of the invention consists of the support disk carrying the support ring is in the form of a thin disk axially deformable in an elastic manner. This elastic support disk is able to deflect laterally by a certain amount, in order to equalize dimensional differences of the width of the trunk and/or to facilitate the entry of the trunk between opposing support disks. I
REFERENCES:
patent: 1881020 (1932-10-01), McFarland
patent: 2569878 (1951-10-01), Avinger et al.
patent: 3347289 (1967-10-01), Kotesovec et al.
patent: 3668965 (1972-06-01), Kreuschmer
patent: 4572256 (1986-02-01), Rautio
patent: 4691749 (1987-09-01), Reuter
patent: 4711279 (1987-12-01), Reuter
Gebruder Linck Maschinenfabrik "Gatterlinck" GmbH & Co. KG
Schrock Allan M.
Watts Douglas D.
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