SAW MACHINE

MACHINE DE SCIERIE

English Abstract

ABSTRACT OF THE DISCLOSURE
A saw machine having one or more saw blades for
ripping the leg downstream of which are provided one or more
parting knives. The problem occurring in saw machines of prior
art is that the spacing of the fixed guiding points working the
log as viewed in the direction in which the log is being sawn,
becomes so large that curve-sawing is no longer possible. In
the saw machine of the invention both the saw blades and the
parting knives are located in a separate sawing unit articu-
latedly attached to the frame of the saw machine and follow-
ing the crookedness of the log.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A saw machine having one or more saw blades for
ripping a log fed to said machine, and one or more parting
knives disposed downstream of said blades, wherein both the saw
blades and the parting knives are mounted in a separate sawing
unit articulated to a frame of of the saw machine for following
the crookedness of the log.

Description

1~1~581
The present invention relates to a saw machine having
one ol- several saw blades ripping up legs and one or several
parting knives disposed downstream of said blades.
Such mounting are known in the art in which the
guides, saw blades and parting knives are fixedly mounted in the
saw machine. The problem in such designs is that the spacing of
lhe fixed guiding points working the timber, as viewed in the
direction in which the leg is sawn, becornes so large that curve-


sawirlg is no longex possible. Therefore the saw blade or blades
fail to follow the crookedness of the tree and they will saw thelog on the line on which they have been fiY~edly mounted. This
reduces substantially the wood utilization ratio.
The present invention eliminates the drawback
mentioned in the foregoing and to provide an improved saw
machine.
According to the present inven-tion ~here is provided a
saw maching having one or more saw blades for ripping a log fed
to said machine, cne or more parting knives disposed downstream

of said hlades, wherein both the saw blades and the parting
knives are mounted in a separate sawing unit articulated to a
frame of the saw machine for following the crookedness of the
log.
Thus in the machine of the invention both the saw
blades and the parting knives are located in a separate sawing
unit articulatedly connected to the saw machine frame and fol-
lowing the crookedness of the log. The articulated attachment
of the sawing unit enables curve-sawing to be carried out even
when processing large-diameter logs, because due to the arti-


culated attachment the spacing of the fixed guiding points in
the direction of sawing is short enough and the saw blades andthe parting knives can be~ter follow the crookedness of the tree
durins the sawing process.




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The present invention will be further illustrated by
way of the accompanying drawing, in which:-

Fig. 1 is an elevational view of a log b~tween theblades and guides of the saw machine in accordance with one
embodiment of the present invention; and
Fig. 2 is an elevational view similar to Fig. 1 of a
sawing unit according to another embodiment of the present
invention.

The saw machine comprises, listed in the feeding
direction, elastically mounted pull wheels 1, a self-centering

set of guide rails 2, hewing cutters 3,4 rotatable about a
horizontal axis and a vertical axis, guide rollers 5, and a
sawing unit 6. The saw blades 7 and the parting knives 8 are
located in the sawing unit 6, which is attached to the frame 9
of the saw machine in an articulated manner, thereby following
the contours of the log.
In the embodiment in Fig. 2, the sawing unit comprises
guide rollers 10 in front of the saw blades 7. Guide rollers 10

guide the sawing unit 6 in accordance with the contours of the
timber 11. The sawing unit 6 is articulatedly attached to the

frame 9 of the saw machine to swivel about a horizontal axis 12,
and it may in addition be mounted to be turnable about a verti-
cal axis 13 indicated with a dash-and-dot line in Fig. 2.
By virtue of the mobility which the articulate
arrangement affords to the sawing unit 6, curve-sawing is now
successfully managed also with large-diameter circular saw
blades 7.
It is obvious to a person skilled in the art, for


example, the number of saw blades 7 and of parting knives 8 may
~ary. Depending on the straightness or crookedness of the log

being sawn, the saw blade\7 and the parting knife 8 may during
the sawing process be in alignment with the lines of the hewing
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cutters 3,4 hewing the sides of the log, as in the Example, or
they may lie on a different line, that is, the parting knife 8
is pivotally mounted with reference to the saw blade 7.




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