Cutting – Cutting motion of tool has component in direction of moving... – Interrelated control of tool and work-feed drives
Patent
1999-03-23
2000-12-12
Rachuba, M.
Cutting
Cutting motion of tool has component in direction of moving...
Interrelated control of tool and work-feed drives
83318, 83326, 83329, 83338, B26D 156
Patent
active
061583189
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a sawing device as defined in the claims.
Traditonally, long timber is sawn to a fixed size by moving the timber against a stopper adjusted to a suitable position with respect to the saw blade used, so that when the timber is in position the saw blade cuts a piece of desired fixed length off the timber. The fixed-length piece is then removed and the timber to sawn is further advanced longitudinally against the stopper. In this manner, sawing is continued in stages by moving the timber and then sawing it.
The main problem with present sawing equipment and methods used to cut timber to a fixed size is that they are slow, which is due to the intermittent nature of the sawing. As the cutting operation itself is a relatively fast action, most of the time is consumed while the saw blade is waiting for the timber to be moved into the sawing position against the stopper. The slowness of sawing is a particularly bad problem in industries where there is a need for large quantities of relatively short fixed-length timber pieces, for example in furniture industry, prefabricated building industry and parquet industry.
SUMMARY OF THE INVENTION
The object of the invention is to eliminate the drawbacks referred to above. A specific object of the invention is to produce a new type of sawing device that enables long timber to be accurately cut into fixed-length pieces in a continuous process as fast as possible.
As for the features characteristic of the sawing device of the invention, reference is made to the claims.
The sawing device of the invention comprises a conveyor for conveying the timber to be sawn and blades for cutting the timber at desired points, said blades being rotated by a first power unit and disposed in a transverse position relative to the lengthways direction of the timber to be sawn. According to the invention, the sawing device comprises a rotatable frame rotated by a second power unit and supporting the blades, of which there are preferably at least two. Moreover, the sawing device comprises a third power unit and, in the rotatable frame, guide rails along which the blades can be moved back and forth by means of the third power unit in the direction on the axles of the blades. i.e. in the longitudinal direction of the timber to be sawn.
Thus, as the axes of rotation of the blades and the axis of rotation of the rotatable frame are parallel to each other and parallel to the direction of motion of the timber to be sawn, it is possible, by rotating the blades and the rotatable frame supporting them, to cut the timber to a fixed size while the timber is in continuous and steady motion, by only moving the blades back and forth in the direction of their axles at the velocity of motion of the timber.
DETAILED DESCRIPTION OF THE INVENTION
The rotatable frame preferably comprises blade axle disposed at the same distance from the axle of the rotatable frame and parallel to it.
The blades are preferably supported by separate blade holders movable along guide bars parallel to the axles of the blades.
The back-and-forth movement of the blades in the direction of their axles is preferably implemented using a motion chain, which is connected to the blade holders and can be moved back and forth.
In a preferred embodiment, none of the power units is mounted on the rotatable frame, but the first, second and third power units are mounted outside the rotatable frame and coupled via concentric axles to the rotatable frame.
The third power unit, which moves the blades back and forth in the direction of the axles, is preferably arranged to work in synchronism with the conveyor that moves the timber to be sawn, in such manner that the velocity of motion of the sawing blade in the direction of its axle is always the same as the velocity of the timber moving on the conveyor.
The sawing device of the invention preferably has two sawing blades mounted in the rotatable frame, but the number of blades can also be considerably larger, in wich a lower speed of rota
REFERENCES:
patent: 4468993 (1984-09-01), McCown et al.
patent: 5063801 (1991-11-01), Wallis
patent: 5544557 (1996-08-01), Wierschke
patent: 5557997 (1996-09-01), Wunderlich et al.
patent: 5924346 (1999-07-01), Wunderlich et al.
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