Woodworking – Rotary cutter – Single saw with side cutter
Patent
1992-06-04
1994-01-18
Bray, W. Donald
Woodworking
Rotary cutter
Single saw with side cutter
144 39, 144218, 144374, 144 41, B27B 3300
Patent
active
052793443
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention concerns a circular saw blade assembly for a saw mill or similar apparatus used for sawing boards from logs, said circular saw blade assembly comprising at least two circular saw blades attachable to and axially transferrable on a saw blade spindle as well as one or several edge milling cutters for shaping the board to a correct width.
BACKGROUND OF THE INVENTION
Known in the art is a method for placing several circular saw blades axially transferrably on a common shaft (U.S. Pat. No. 3,630,244). This arrangement has a drawback in that the gap between the adjacent circular saw blades does permit the placement of edge shaping cutters to correct width for the trimming of the boards, but instead, the milling of the edge must be performed as a separate workphase.
Also known in the art is an arrangement in which the edging of the log prior sawing is unnecessary and which makes the axial adjustment of spacing between the saw blades possible. One such implementation is disclosed in FI patent application 881402. The system described in the application comprises a circular saw blade assembly which has two circular saw blades on a spindle and the spindle hubs are further designed to act as cutters, whereby the cutter attached to the inner circular saw blade is formed into a cage supporting by its end side an inner circular saw blade, and the inner cutter supporting an outer circular saw blade by its end side is located axially transferrable inside the cage-like cutter and extends through the center hole of the inner circular saw blade.
Such an axially adjustable circular saw blade assembly has only two circular saw blades, whereby only a wane and a slab can be cut from a log. The construction of the circular saw blade assembly is complicated, thereby leading to high costs. One of the cutters has constantly a maximum width, which causes wasteful use of log material, and correspondingly, to unnecessary growth of expenses. In addition, the diametrical difference of the cutters is small, which limits their useful operating range.
SUMMARY OF THE INVENTION
It is an object of the present invention to achieve a circular saw blade assembly capable of overcoming the above-described drawbacks. The assembly in accordance with the invention is characterized in that the edging cutters are formed by cutter elements adapted to adjacent circular saw blades so that the elements are axially adjustable in relation to each other and the cutter elements are comprised of one or several cutter knives and a block section having a recess machined into the face opposing the adjacent cutter element and having a penetrating hole for the saw spindle to pass, whereby the knives of the adjacent cutter elements are aligned to rotate along a single circle with an axial displacement of the elements at the different points along the cutting circle.
A preferred embodiment of the assembly in accordance with the invention is characterized in that both cutter elements are comprised of two diametrically oppositely placed cutter knives and that the adjacent cutter elements are phase-shifted by a 90.degree. angle.
Another preferred embodiment of the method in accordance with the invention is characterized in that both cutter elements are comprised of three cutter knives diametrically spaced at 120.degree. angle and that the adjacent cutter elements are phase-shifted by 60.degree. angle.
A further preferred embodiment of the method in accordance with the invention is characterized in that the cutter elements are attached to the circular saw blade by screw clamps and that the surface of the cutter element facing the circular saw blade is flat.
The circular saw blade assembly in accordance with the invention offers an improved support of the blade between the flanges. All circular saw blades of the assembly are axially movable, whereby the edge cutter elements are simultaneously adjusted correspondingly, thus making it easy to alter the thickness of the board to be sawn without a need for changing the edge cutter
REFERENCES:
patent: 1167801 (1916-01-01), De Laney
patent: 3630244 (1971-12-01), Cromeens
patent: 4266584 (1981-05-01), Lomnicki
patent: 4456045 (1984-06-01), Gregoire
patent: 5143127 (1992-09-01), Rautio
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