Woodworking – Special-work machine
Patent
1991-11-22
1993-06-15
Bray, W. Donald
Woodworking
Special-work machine
144242D, 144343, B27L 100, B27C 112
Patent
active
052190102
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION AND PRIOR ART
This invention is related to a device according to the preamble of appendent claim 1. The device is primarily intended to have the character of a tree processor arranged to subject trees or tree trunks to any arbitrary processing. Such processing may comprise one or more of the following processing steps: gripping and felling standing trees, delimbing of tree trunks, barking of tree trunks and cutting of tree trunks into desired lengths.
Tree trunks have different coarseness between themselves as well as with regard to an individual tree trunk. In order to be able to feed tree trunks through a tree processor its feed members must be fairly correctly located and in contact with the tree trunk. Difficulties are involved in achieving such a correct contact over a wide coarseness range. Therefore, one proceeds most often by providing tree processors in different coarseness classes, e.g. one processor intended for the small dimension tree trunks occurring in connection with thinning work and another for the coarser trunks to be processed on final felling. It is to be pointed out that it is not a practically useful solution to increase the width of the feed rolls parallel to their axes of rotation since it makes the processor unacceptably bulky and involves increased costs for the feed rolls.
However, a device according to the preamble of claim 1 is known by SE B 457 069. This device has feed members, which on movement thereof towards and away from each other also will be displaced relative to the body structure so that the feed members will be located generally opposite to the tree trunks independently of coarseness variations thereof. More specifically, this is obtained by means of parallel systems of arms, which for each of the feed members form an articulated quadrangle, the articulation axes of which extend at acute angles to the axes of rotation of rolls comprised in the feed members. Such parallel systems of arms cause disadvantages in so far as being relatively costly and besides having a relatively great space requirement.
SUMMARY OF THE INVENTION
The object of the present invention is to devise ways to develop the device defined in the preamble of claim 1 so that it becomes capable of carrying out the coarseness dependent displacement of the first feed members while having a simple construction and a compact design.
This object is obtained according to the invention primarily by means of the feature defined in the characterizing part of appendent claim 1.
Preferable developments of the invention are defined in the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the enclosed drawings, a more specific description of embodiment examples of the invention will follow hereinafter.
In the drawings:
FIG. 1 is a diagrammatical perspective view of a first embodiment of the device according to the invention;
FIG. 2 is a side view of the device in FIG. 1;
FIG. 3 is a view of the device from its forward end, the device being adjusted to feed a thin object or tree trunk;
FIG. 4 is a view similar to FIG. 3 but with the device adjusted for a coarse object or tree trunk;
FIG. 5 is a perspective view of a portion of the device according to preceding Figures;
FIG. 6 is a view similar to FIG. 5 but illustrating a different position;
FIG. 7 is a perspective view of a second embodiment according to the invention;
FIG. 8 is a side view of the embodiment according to FIG. 7;
FIG. 9 is a front view illustrating the device adjusted for a thin trunk or object;
FIG. 10 is a view similar to FIG. 9 but illustrating an adjustment for a coarse trunk or object; FIG. 11 is an enlarged perspective detail view of a portion of the device; according to FIGS. 7-10; and
FIG. 12 is a view similar to FIG. 11 but illustrating a different position.
DETAILED DESCRIPTION OF THE EMBODIMENT ACCORDING TO FIGS. 1-6
The tree processor according to FIGS. 1-6 comprises a body structure 1 and arm like support members 2, which are arranged on the body structure and which support feed members
REFERENCES:
patent: 4081007 (1978-03-01), Loigerot
patent: 4515192 (1985-05-01), Eriksson
patent: 4766939 (1988-08-01), Forslund
patent: 4800936 (1989-01-01), Pomies et al.
patent: 4834156 (1989-05-01), Forslund
patent: 5082036 (1992-01-01), Vierikko
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