Woodworking – Combined machine – Planing and sawing
Patent
1990-10-25
1992-09-01
Bray, W. Donald
Woodworking
Combined machine
Planing and sawing
831021, 144 41, 144369, 144378, B27C 900
Patent
active
051431270
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a sawing machine for the sawing of boards or equivalent from logs, consisting of log feeding devices, cutter heads for chipping the log surface, and disc saw units for sawing the logs in the lengthwise direction, the sets of rotation axles of said disc saw units being located on opposite sides of the log, each of said units comprising at least one disc saw blade and one or more chipper edgers for chipping the board to the right width, in which units the disc saw blades and the chipper edgers, respectively, placed on opposite sides of the log are mutually aligned relative to the lateral direction of the log, the sawing machine being provided with divider blades, placed after the disc saw units, for separating the sawn boards or equivalent.
A sawing machine of this type is proposed in FI-patent application 824207. It comprises two disc saw units placed above and below the log to be sawn. The disc saw blades are large enough in diameter to allow them to cut as deep as halfway through the log, or rather somewhat deeper to ensure that the blades will make a complete cut. In FIG. 1 of said FI-patent application, the disc saw units seem to be placed at the same vertical plane, but in practice they must be staggered in the longitudinal direction of the log to avoid the blades hitting each other. The disc saw units also comprise chipper edgers for cutting the boards to the desired width. If the board width is to be altered, then the chipper edgers have to be replaced with new ones of the appropriate size. This is naturally time-consuming. Moreover, a large number of different-sized chipper edgers for different board widths need to be kept in store. A further drawback in the sawing machine proposed by FI-patent application 824207 is that each disc saw unit is driven by a separate motor (not shown in the drawing), which also adds to the cost.
The object of the present invention is to create a sawing machine that is free of the disadvantages referred to. The sawing machine of the invention is characterized in that the position of the axle sets of the disc saw units relative to the midline of the log to be sawn is adjustable.
A preferred embodiment of the sawing machine of the invention is characterized in that the divider blades - known in themselves - placed after the disc saw units are connected to at least one of the disc saw units in such manner that the position of the divider blades is altered depending on the position of the disc saw units.
Another preferred embodiment of the sawing machine of the invention is characterized in that the machine has two motors for driving the disc saw units, one motor on each side of the sawing line, and that the driving motors are coaxially arranged.
The invention provides several advantages over previously known techniques. The chief advantage is that, due to the adjustability of the disc saw units, there is no need to replace the chipper edgers when the board width is to be changed. In the embodiment presented by the figures, described below in greater detail, it is only necessary to adjust the disc saw units so as to turn the plane passing through their axles until the vertical distance between the chipper edgers of the upper and lower disc saw units becomes equal to the desired board width. In other words, the position of the axle sets of the disc saw units is adjusted relative to the midline of the log, so that the boards can be chipped to the desired width by the edgers. Using a branching gear between the driving motor and the disc saw units, only one motor is needed on each side of the sawing line, thus allowing the construction of the sawing machine to be simplified.
In the following, the invention is described by the aid of an example, reference being made to the drawing attached, wherein:
FIG. 1 presents the sawing machine of the invention in top view.
FIG. 2 presents the disc saw units of the sawing machine of the invention, seen from the direction in which the logs are sawn.
FIG. 3 shows a diagram of the disc saw units and the divider
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