Cutlery – Cutting tools – Plural cooperating blades
Patent
1989-08-23
1991-07-02
Watts, Douglas D.
Cutlery
Cutting tools
Plural cooperating blades
83666, 144378, B26B 1300, B26B 112, B27B 100
Patent
active
050275178
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a circular saw head for the sawing of side boards from logs (2) or blocks, with an axially outer and inner circular saw blade (105, 106), each provided with a rim of saw teeth (13) and mounted on the frontal side on a supporting flange, on a common hub.
Circular saw heads of this type are usually located in pairs one or either sides of the log or block to be processed and cut one or several side boards, while the log or block is being passed along the circular saw heads. The log or block is guided both by the advance mechanism and the stationary guide elements, which should extend as near the saw heads as possible, in order to support and guide the wood as near as possible to the cutting location.
The "outer" circular saw blade is defined in this context as the blade located on the frontal side on the saw head and producing the inner cut on the log being processed. The "inner" saw blade is axially recessed relative to the outer saw blade and produces the outer cut on the log.
As it is necessary to adjust the circular heads for resetting to different wood dimensions, the guide elements must also be adjusted, which requires a relatively large effort. For this reason, in most cases such additional guide elements are eliminated. This, however, frequently leads inadequate guidance of the wood in the sawing area. The lateral forces generated by the inaccurate guidance of the wood and applied by the wood to the circular saws, make it necessary to use sufficiently thick saw blades, so that they are able to absorb said lateral forces. This results in a wider cut, which in turn leads to an increased production of wood chips, representing an appreciable loss of material.
A circular saw head of the aforementioned generic type without guide elements for the wood is described in DE 03 508 716.
It is known (U.S. Pat. No 861,218) to provide in the case of a single circular saw blade two lateral annular supporting surfaces, located inside the rim of saw teeth and radially spaced apart from it. The annular supporting surface on the frontal side projects axially past the frontal surface of the saw blade and is located in the plane of the frontally outer edge of the saw teeth. By means of these bilateral supporting surfaces the relatively thin saw blade is guided in the cutting gap, so that lateral vibrations are prevented. No guidance or support of the cut wood is provided.
A cutting head is further known (DE 1 913 295) in which a freely rotating, annular frontal surface is provided for the wood being processed.
It is therefore the object of the invention to design a circular saw head of the aforementioned type so that an improved lateral guidance of the wood and thus a reduction of the lateral forces applied by the wood to the saw blades is obtained.
This object is attained according to the invention in that between the support flange of the outer saw blade and the support flange of the inner saw blade a supporting ring is mounted in a freely rotating manner, said ring having an annular supporting surface located between the two support flanges and extending axially over the frontal surface of the inner saw blade, said ring being located in the plane of the frontally outer edges of the saw teeth of the inner blade.
The supporting surface inside the inner saw blade supports the side board produced between the two saw blades. This support of the side board at its outer edge prevents it from applying a lateral force to the inner saw blade. The inner saw blade, which now forms only a relatively narrow annulus and projects only slightly over its support flange, may therefore be relatively thin, so that the cutting gap produces is narrow. The cutting loss experienced is therefore also lower.
The guide of the side board at its outer edge by the freely rotating supporting ring results in an improved guidance of the wood, which contributes significantly to the obtention of more accurately cut wood products. The log is being guided between the support rings of the two pairs of circular saw heads, as the lateral
REFERENCES:
patent: 3656395 (1972-04-01), Goelimer
patent: 3889333 (1975-06-01), Katz
patent: 4513544 (1985-04-01), Lossl et al.
patent: 4633847 (1987-01-01), Lossl et al.
patent: 4690188 (1987-09-01), Hasenwinkle
Gebruder Linck Maschinenfabrik "Gatterlinck" GmbH & Co. KG
Heyrana Paul M.
Watts Douglas D.
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