Woodworking – Combined machine – Planing and sawing
Patent
1985-12-30
1987-09-08
Bray, W. D.
Woodworking
Combined machine
Planing and sawing
83499, 834254, 835082, 83504, 83700, 144373, 144377, B27C 900
Patent
active
046917497
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a sawing and cutting apparatus for logs, with at least one knife head which serves as a cutting tool for the production of wood chips and at least one circular sawblade connected with a saw shaft arranged coaxially and spaced thereto which serves to saw off at least one sideboard.
In the processing of round timber logs to lumber such as boards and square timber, it is known from the so-called profile-cutting method how to cut the exterior wood parts which would give slabs with knife heads to wood chips suitable, for example, for the production of chipboard or cellulose.
In a known apparatus of the initially described type (DE-OS 29 47 190), two opposite-lying knife heads and several intermediate-lying circular saw blades are arranged on a common shaft. The difficulty with this, however, is that the knife heads have to be driven at a relatively low rotational speed to produce wood chips of sufficient fiber length, whereas a sufficiently high rotational speed is required for driving the circular sawblade with respect to the required sawing quality. Both requirements can not be fulfilled simultaneously with the known apparatus, so that in general a too high rotational speed of the knife heads and with it an insufficient quality of the wood chips produced has to be put up with.
Furthermore, in the known apparatus the circular sawblades are arranged rigidly on the common drive shaft so that only boards or square timber of constant width can be produced. An adjustment to different desired dimensions is not possible or only through an expensive reconstruction of the apparatus.
It has already been known for a long time (DE-OS 20 10 060) how to carry out the sawing process for the production of the sideboard or sideboards simultaneously, but independent of the cutting process. In the known apparatus, belt saws or gang saws are used which also make possible an adjustment of the width. The feed rate of the logs must be chosen relatively low in this case, however, to accomodate the requirements of the sawblades, which in turn is disadvantageous for the cutting process.
The relatively high feed rate of the logs possible with the cutting tools for wood chip production, which is desirable for reasons of high work capacity, makes it necessary to carry out the sawing-off of the sideboard or sideboards, respectively, with rapidly running circular saws which are usually spaced at greater distances to the cutting tools in the feed direction of the logs, for example, double circular saws in pairs on top of each other, or displaced with respect to one another. In this arrangement, with a high feed rate, the rotational speeds of the knife heads and circular sawblades can be optimally chosen in each instance with a high feed rate of the logs, but the spatial separation of the knife heads and the circular sawblades causes unavoidable imprecisions, especially for the thickness of the sideboard to be sawed off. Only with expensive guide measures can it be assured that the surface of the sideboard sawed by the circular sawblades is sufficiently parallel to the plane surface produced beforehand by the knife head (DE-OS 29 18 622).
It is therefore the object of the invention to design a sawing and cutting apparatus of the initially described type in such a way that an adjustment to varying thicknesses of the sideboard to be sawed off is made possible at optimal speeds of the knife head and the circular sawblade in a straightforward manner.
This object is attained according to the invention by connecting the knife head with a hollow shaft, supporting the saw shaft rotatably and axially displaceable in the hollow shaft and connecting the saw shaft with a drive apparatus which delivers a higher rotational speed than the hollow shaft.
With the separate drive of the saw shaft with higher rotational speeds than the hollow shaft of the knife head, the respective optimal rotational speeds can be chosen for each of the two separate working processes, so that on the one hand wood chips with s
REFERENCES:
patent: 3630244 (1971-12-01), Cromeens
patent: 3630513 (1971-12-01), Davidson, Jr. et al.
patent: 3750513 (1973-08-01), Cromeens
patent: 4335767 (1982-06-01), Reuter
patent: 4456045 (1984-06-01), Gregorie
Bray W. D.
Gebruder Linck Maschinenfabrik und Eisengiesserei "Gatterlinck"
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