Woodworking – Special-work machine
Patent
1986-07-15
1987-09-15
Bray, W. D.
Woodworking
Special-work machine
144208E, 144343, A01G 2302, B27L 100
Patent
active
046932879
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a bundle limber of the type comprising a rotatably mounted drum within which a number of processing devices are mounted for mechanically processing a bundle of stems or stem portions with twigs in order to limb and preferably also feed said stems or stem portions longitudinally through the drum.
PRIOR ART
In prior art bundle limbers of the above described type, the drum comprises a plurality of individual sections or cylinders between which there are annular gaps through which those twigs can be discharged which are removed from the stems as the stems are fed through the drum and processed, on the one hand in that the stems are tumbled therein and thus process each other and, on the other hand, by the action of the processing devices within the drum. Up to now, these processing devices have consisted of projecting cutters or ridges which are fixedly mounted on the inside of the drum and inclined relatively to the longitudinal axis of the drum and which serve to remove the twigs they come into contact with and also to provide for the necessary longitudinal feeding of the stems through the drum. In order to provide as good a processing effect as possible, the drum has, in actual practice, been given a length of about 20 m. This has implied, however, that the vehicle on which the drum is mounted, has become extremely cumbersome and cannot be used on forest roads near the cutting place, but must be stationed more or less centrally in the cutting area. This in turn has entailed considerable mileage and heavy expense for conveying the trees from the cutting place to the centrally stationed bundle limber. A further pronounced disadvantage of the known limber is the exceedingly mediocre limbing effect of its processing cutters which, in spite of the great length of the drum, are unable to produce completely limbed stem portions.
BRIEF DESCRIPTION OF THE INVENTIVE IDEA
The present invention aims at eliminating the above-mentioned drawbacks of prior art bundle limbers of the type mentioned by way of introduction, and at providing a bundle limber which, though not very long, radically increases the limbing effect. According to the invention, this is achieved primarily in that each processing device consists of or comprises a member mounted on the inner side of the drum and rotatable relatively thereto, said member comprising one or more tearing, cutting and/or shearing tools adapted to remove, during rotation relative to the drum, the twigs from the stem portions by tearing, cutting and shearing, respectively.
BRIEF DESCRIPTION OF THE ENCLOSED DRAWINGS
In the drawings,
FIG. 1 is a schematic perspective view illustrating the inventive bundle limber in operation;
FIG. 2 a schematic, partly cut perspective view showing a section of the drum included in the bundle limber;
FIG. 3 a partly cut end view through the drum section in FIG. 2; and
FIG. 4 a longitudinal view of an alternative embodiment of the invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
In FIG. 1, 1 designates a wheel-mounted chassis which supports, on the one hand, a limbing drum generally designated 2 and designed in accordance with the principle of the invention and, on the other hand, a crane 3. The drum 2 is open at its two opposite ends while forming an infeed opening 4 and a discharge opening 5 connected with an infeed conveyor 6 and a discharge conveyor 7, respectively, in the form of, for example, endless belts. At 8, a number of stems or stem portions with twigs are shown. By means of grapples 9 on the crane 3, the stems or stem portions are conveyed in bundles from the landing to the infeed conveyor 6, whereupon a bundle of stems of any required size can be longitudinally fed through the drum 2 for limbing. Finally, the limbed stem portions received on the discharge conveyor or table 7 can be removed and stacked by the side of the road 10. As clearly shown in FIG. 1, the drum 2 is disposed beside the centre of the chassis 1 so that the chassis may accommodate the crane 3, and f
REFERENCES:
patent: 3385331 (1968-05-01), Bronemo et al.
patent: 3690352 (1972-09-01), Herdf
patent: 3789893 (1974-02-01), Carson et al.
patent: 3913644 (1975-10-01), Braun
patent: 4180109 (1979-12-01), Heikkinen
patent: 4303111 (1981-12-01), Neville
patent: 4445558 (1984-05-01), Banner et al.
patent: 4574854 (1986-03-01), Lindblom et al.
patent: 4596280 (1986-06-01), Svensson et al.
Derwent's Abstract D 5770 C /16, SU 679 390.
Derwent's Abstract C 8002 B /13, SU 605 713.
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