AT522870A1 - Thin-cutting band saw - Google Patents

Abstract

A thin-cutting band saw is described for producing lamellas from a pre-processed wood workpiece (2) with a guide table (1) and with a guide roller (3) opposite the guide table (1), which can be acted upon by a hold-down force and which has at least one guide roller (3) transverse to the feed direction (5). , but is arranged upstream of the saw band (6) running parallel to the guide table (1). In order to create advantageous sawing conditions, it is proposed that a guide shoe (8) for the wooden workpiece (2) parallel to the guide table (1) is provided on the side of the saw band (6) opposite the guide table (1) in its cutting area.

Description

The invention relates to a thin-cutting band saw for the production of lamellas from a pre-machined wood workpiece with a guide table and with a guide roller opposite the guide table, which can be acted upon by a holding-down force and which is arranged in front of at least one saw band running transversely to the feed direction but parallel to the guide table

For sawing thin lamellas from wooden workpieces that are pre-machined by sawing or planing, band saws with a saw band running parallel to a guide table for the wooden workpiece are known (AT 11471 U1), which cuts through the wooden workpiece driven by a feed drive parallel to the table. So that plane-parallel lamellas can be cut, the wooden workpiece must be pressed flat against the guide table in order to compensate for any warping in the pre-processed wooden workpiece. For this purpose, feed rollers which can be acted upon by a prescribable hold-down force are provided, which not only drive the wooden workpiece in the feed direction along the guide table, but also press it flat against the guide table. However, the resulting guidance of the wooden workpiece is not sufficient to maintain good cutting conditions in the area of the cut end, because the lamella in the area of the cut end is only connected to the rest of the wooden workpiece via a narrow web to be cut and after being released by the feed roller The saw band can lift off with the effect that a step is sawed. In addition, internal stresses are released by sawing, which can lead to tears in the end area of the lamella.

The invention is therefore based on the object of designing a thin-cutting band saw in such a way that the lamellae can also be sawed in the end region of the cut without steps and tears.

Based on a thin-cutting band saw of the type described above, the invention solves the problem in that on the side of the saw band opposite the guide table, a guide shoe for the wooden workpiece is provided in its cutting area, parallel to the guide table.

Due to the provision of a guide shoe guiding the lamellae in the cutting area, cutting conditions are surprisingly ensured in the area of the cutting end which prevent the cut lamella end from being torn out and stepping. This is obviously achieved in that the flat contact of the guide shoe on the outside of the slat opposite the cut surface results in a slat guide in which the slat only has freedom of movement in the feed direction relative to the sliding surface of the guide shoe and consequently does not have the properties of a thin lamella, but a lamella, which experiences a corresponding stiffening by the guide shoe. As a result of this effect, sawn thin lamellas are obtained which have a continuous, undisturbed cut surface so that higher cutting accuracy can be achieved or thinner lamellas can be sawn in comparison to the lamellae sawn with known thin-cutting band saws.

It is crucial that the guide shoe is effective in the cutting area, i.e. on

Improvements in cut quality with it.

In order to be able to adapt the guide shoe to the respective thickness of the wooden workpiece, the guide shoe can be moved perpendicular to the guide table,

and preferably also in relation to the upstream guide roller.

In order to achieve a largely uninterrupted guidance of the wooden workpiece in the area of the end of the cut, the guide shoe can extend into the gusset area between the guide roller and a tangential plane parallel to the guide table on the circumferential section of the guide roller facing the guide table, the teeth of the saw blade extending in the area of the the section of the guide shoe extending over the crotch region. With this design specification, the end of the wood workpiece still to be sawed is guided by the guide shoe alone in a manner that is advantageous for the rest of the sawing process immediately after being released by the guide roller, so that the lamellas can also be sawed in the end area with the quality that was achieved before this end area becomes.

The proposed measure of pressing a guide shoe in the cutting area of the saw band against the outer surface of the wooden workpiece facing away from the saw band can also be used successfully when providing two or more saw bands following one another perpendicular to the guide table, because the sawing conditions for the lamellae cut simultaneously by the saw bands in the The end area depends largely on the saw-ready guidance of the outer lamella furthest away from the guide table.

The subject matter of the invention is shown in the drawing, for example. It

demonstrate

Fig. 2 shows the guide shoe for the wooden workpiece in a view opposite to the feed direction on a larger scale and

3 shows a section along the line IN-II of FIG. 2 on a larger scale.

As can be seen in particular from FIG. 1, a thin-film band saw according to the invention has a guide table 1 for the pre-machined wood workpiece 2 to be sawed, which is pressed against the guide table 1 with the help of a guide roller 3 under a holding force, which is used to advance the wood workpiece 2 Can comprise conveyor belt 4 or a conveyor chain, if feed rollers are not provided for this purpose. According to FIG. 3, the guide roller 3 is preceded in the feed direction 5 by a saw band 6 which runs transversely to the feed direction 5 at a perpendicular distance from the guide table 1 and parallel to it. This saw band 6 is endlessly guided around deflection wheels 7, of which at least one is driven. On the side of the wooden workpiece 2 facing away from the guide table 1, a guide shoe 8 is provided in the cutting area, i.e. in the area of the teeth of the saw band 6, which is subjected to a hold-down force and with its sliding surface 9 lies flat on the wooden workpiece 2.

The arrangement is such that the guide shoe 8 protrudes into the gusset area between the guide roller 3 and a tangential plane parallel to the guide table 1 on the peripheral section of the guide roller 3 facing the guide table 1, i.e. into the gusset area between the guide roller 3 and the wooden workpiece 2 . The teeth 10 of the saw band 6 run below this gusset area so that a largely uninterrupted transition from the guide roller 3 to the guide shoe 8 results in relation to the guidance of the wooden workpiece 2.

In order to adapt the guide formed by the guide roller 3 and the guide shoe 8 to the thickness of the wooden workpiece 2, these structural parts are in one

Arranged bracket-like carrier 11, which with the help of guide columns 12 perpendicular

As can be seen from FIG. 2, the guide roller 3 is mounted in end-face bearings 16 which are arranged on the web 18 of the bow-shaped carrier 11 connecting the two side cheeks 17. The guide shoe 8 is fastened to a support strip 19 which connects two lateral pivot levers 20. These pivot levers 20 are mounted on the inside of the side cheeks 17 of the bow-shaped support 11 so that they can pivot about axes 21. The support bar 19 is adjustable with respect to a rigid connection 22 between the two cheeks 17 by means of adjusting screws 23 so that the guide shoe 8 is not only positioned with the guide roller 3 on the wooden workpiece 2, but also opposite the guide roller 3 perpendicular to the guide table 1 according to the respective requirements can be adjusted.

As can be seen in particular from Fig. 3, the wooden workpiece 2 is released from the guide roller 3 in the area of the cut end shown, without having to forego a saw-appropriate guide, because the end of the wooden workpiece 2 remains guided accordingly by the guide shoe 8, namely in the cutting area which is decisive for this and which is determined by the course of the teeth 10. This means that the remaining web between the lamella 24 already cut from the wooden workpiece 2 and the wooden workpiece 2 can be severed without the risk of tearing or step formation, so that the quality of the cut surface remains constant over the entire length of the lamella.

Claims (3)

(42705) II claims 1. Thin-cutting band saw for the production of lamellas from a pre-machined wood workpiece (2) with a guide table (1) and with a guide roller (3) opposite the guide table (1), which can be acted upon by a holding-down force, but which has at least one guide roller (3) transverse to the feed direction (5) The saw band (6) running parallel to the guide table (1) is arranged upstream, characterized in that on the side of the saw band (6) opposite the guide table (1) in its cutting area a guide shoe (8) parallel to the guide table (1) for the wooden workpiece ( 2) is provided. 2. Thin-cutting band saw according to claim 1, characterized in that the Guide shoe (8) can be displaced perpendicular to the guide table (1). 3. Thin-cutting band saw according to claim 1 or 2, characterized in that the guide shoe (8) is in the gusset area between the guide roller (3) and a tangential plane parallel to the guide table (1) on the peripheral portion of the guide roller facing the guide table (1) (3) and that the teeth (10) of the saw band (6) run in the area of the section of the guide shoe (8) which extends into the crotch area.