Cutting – Operation controlled by detector means responsive to work – Positioning of tool controlled
Patent
1988-12-05
1990-10-02
Phan, Hien H.
Cutting
Operation controlled by detector means responsive to work
Positioning of tool controlled
83 755, 83370, 834254, 834352, 835081, 835083, B27B 522, B27B 3106
Patent
active
049600230
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND OBJECTS OF THE INVENTION
The invention concerns a circular cross-cut saw for the cutting-to-length of boards. A conveyor advances the boards which are arranged transversely to the direction of conveyance. Several circular cross-cut saw units are movable individually toward the path of motion of the transverse conveyor installation and are supported on a saw slide that may be transversely adjusted.
Boards, i.e., elongated wood products, such as planks and deal boards arriving at a saw machine, usually must be cut on both ends to a predetermined length by means of cross-cut saws. Numerous known installations have in common that each board arriving on a transverse conveyor unit is at first moved so that a first end thereof abuts against a stop or the like, and then smooth-cut at the end (DE No. 26 10 912), several cross-cut saw units are located on a common slide, the range of displacement of which then must be only approximately as long as the mutual distance of adjacent cross-cut saw units, so that saw cuts may be carried out selectively within the entire range equipped with cross-cut saw units.
In this manner a significant reduction of the time required for the positioning of the cross-cut saw unit intended to cut the board to a given length is obtained. However, for the cutting of the board first end only a single, stationary cross-cut saw is provided. It is, therefore, necessary there again to run the board initially against a stop before the first end may be cut by that single saw unit. The longitudinal positioning of the board requires a separate longitudinal positioning unit and consumes time.
It is, therefore, an object of the invention to design a cross-cut saw of the afore-mentioned type whereby the time required or the cutting of boards would be substantially reduced and whereby in particular, the need to align the boards transversely before cutting would be eliminated so as to enable the apparatus to be simplified.
SUMMARY OF THE INVENTION
This object is attained according to the invention by orienting cross-cut saw units in two groups on two saw slides, the slides being capable of separate transverse adjustment.
The boards to be cut to a predetermined length need not be positioned against a stop, but rather may be transported in any arbitrary transverse orientation on the conveyor. If prior measurements of the board indicate that saw cuts must be carried out on both ends, the two saw slides are positioned independently of each other so that always one of the saw units located on each slide is in an appropriate position for the cutting of the respective end of the board. The two saw units selected are displaced toward the travel path of the board and cut the board exactly to the predetermined length.
No transverse displacement of the boards on the transverse conveyor installation is required in order to bring a board end into a predetermined relationship with a fixed saw unit. The time required for the cutting operation is, as a result, reduced in accordance with the present invention.
THE DRAWING
The objects and advantages of the invention will become apparent from the following detailed description of a preferred embodiment thereof in connection with the accompanying drawings in which like numerals designate like elements, and in which:
FIG. 1 is a top plan view of a conveyor installation for boards, upon which a circular cross-cut saw for the cutting to length of boards is located;
FIG. 2 is a section on the line II--II of FIG. 1;
FIG. 3 is an enlarged section on the line III--III of FIG. 2; and
FIG. 4 depicts examples of possible cuts on different boards.
DETAILED DESCRIPTION OF A PREFERRED
EMBODIMENT OF THE INVENTION
The transverse conveyor installation 1 shown in FIGS. 1 to 3 comprises several adjacent conveyor chains 2, spaced apart and parallel to each other. Boards 3 to be cut are transported by upper flights of the chains in the direction of the arrow 4. The boards 3, which may be planks, deal boards or similar elongated wood products, extend transversely to
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patent: 3036605 (1962-05-01), Joa
patent: 4031790 (1977-06-01), Arvidsson
patent: 4468992 (1984-09-01), McGeehee
patent: 4541722 (1985-09-01), Jenks
patent: 4700758 (1987-10-01), Bernath
Klumpp Gunter
Reuter Alfred
Gebruder Linck Maschinenfabrik "Gatterlinck" GmbH & Co. KG
Phan Hien H.
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