FI80230B - Veneer cutter - Google Patents

Description

80230

VENEER CUTTER - FANERSKÄRARE

The present invention relates to a veneer cutter consisting of a rotating counter roll, in connection with which, preferably above, there is a rotating cutting blade which, during cutting, is supported on a camshaft above.

Above is a camshaft (shaped shaft) on which the blade body rests at the time of cutting. The camshaft transmits the cutting force to the rigid frame beam.

When the speed of the veneer is relatively high and defects need to be removed from the veneer, the same blade must be cut twice, ie relatively wide (150 mm-300 mm) debris veneers are obtained in one turn, depending on the cutter.

Figures 1 and 2 show a prior art with a double-sided cutting blade, the sharp part of which rests on a soft roll above.

The main reason why a rotary blade cutter has been developed is that it does not stop or congest veneer at the time of cutting, like an impact blade cutter. Thus, it allows remarkably high veneer speeds and is also silent and durable.

The object of the invention is to provide a simple veneer cutter in which the error cuts can be dimensioned to be quite small according to the errors. The veneer cutter according to the invention is characterized in that the veneer cutter has a second cutting blade, equal to the same counter roll, in the direction of travel of the veneer after the Yiähti cutting blade. When both blades and the counter roller still have separate actuators, their independent operation is enabled. Seen in the direction of travel of the veneer, the first blade normally cuts the veneers and the second blade cuts defects with a width of less than e.g. 300 mm. The error cut can be any size, such as 20-30 mm. In a special case, when, in addition to a small error cut, only a small joint veneer is produced, the cutting blade is rotated at twice the speed of free time, thus enabling the debris and the joint veneer to have a connection width of 150 mm. In this case, for example, the debris is 30 mm and the joint veneer is 120 mm.

An embodiment of the invention is characterized in that the blades consist of petals rotating about their axis and according to the speed of the veneer, which rotation speed is twice the rotational speed of the camshafts rotating with the blades, and that the camshafts have segments removed so that the petals can rotate rotation occurs. This type of construction is very simple and the power requirement is very low compared to known devices. The speed of rotation of the blades can also be three, four or more times the speed of rotation of the camshafts rotating in connection with the blades.

The invention will now be described by way of example with reference to the accompanying drawing, in which

Figures 1-3 show prior art cutters.

Figure 4 shows a veneer cutter according to the invention seen obliquely from above.

Figure 5 shows a veneer cutter in cross section.

Figure 6 shows a veneer cutter seen in the direction of travel of the veneer.

Figure 7 shows a detail of the veneer cutter blades and counter roll.

3 80230

Figures 8 and 9 show camshafts of different shapes.

The veneer cutter consists of a rotating counter roll 1, above which there is a rotating cutting blade 2, which is supported on the upper camshaft 3 during cutting. The veneer cutter has a second cutting blade 5 equal to the same counter roll 1 after the cutting blade 2 in the direction of veneer 4. Each blade 2, 5 and their camshafts 3, 6 have separate actuators. The blades 2, 5 consist of blades 9, 10 rotating about their axis 7, 8 and according to the speed of the veneer, the rotational speed of which is twice the speed of the camshafts 3, 6 rotating in connection with the blades. The camshafts 3, 6 are made so that the blades 9, 10 can rotate at the removed segments in the camshafts when the blades are rotated or the veneer passes without cutting in the veneer cutter. The lower counter roller 1 always rotates at the speed of the veneer. At the time of cutting, the upper blade 2 rotates at its veneer speed about its axis 7. The cutting takes place by pressing between the petal 9 and the counter roll 1. In a normal sheet-cutting operation, only one of the blades 2 rotates and cuts across the veneer. In an error cutting event, when the cut is less than 300 mm, both blades 2, 5 perform the cut. Thus, the error cut can be any size, such as 20-30 mm. With this solution, the minimum cutting dimension is not dependent on the line speed, but is constant.

♦

Claims (4)

A veneer cutter consisting of a rotating counter roll (1), in connection with which, preferably above, there is a rotating cutting bite (2) which, in connection with the cutting, is supported against an overlying cam shaft (3), characterized in that: that in the veneer cutter after the cutting bit (2) seen in the threaded direction of the veneer (4) there is a second similar cutting bit (5) above the same counter roll (1). 2. Veneer cutter according to claim 1, characterized in that the beds (2,5) and the counter roll have separate drive devices. 3. Veneer cutter according to claim 1 or 2, characterized in that the bites (2,5) are formed by circular axial shafts (7,8) according to the speed of the veneer rotating cutting blades (9, 10), the rotational speed of which is double to that of in connection with the bites rotating the camshafts (3,6), and that from the camshafts (3,6), segments have been removed, so the cutting blades (9, 10) have room to pivot around the segments during the rotation of the bets. 4. Veneer cutter according to any one of claims 1-3, characterized in that the rotational speed of the cutting blades (9,10) is three, quadruple or multiplied by the rotational speed of the rotary camshafts (3,6). We in tejulkaisuja-Ancillary public ions