FI87431B - ANORDNING FOER KAPNING AV FANER. - Google Patents

Description

87431

Device for cutting plywood veneer

The present invention relates to a device for cutting plywood veneer.

5

The device is intended to cut a veneer mat coming from a plywood lathe either by cutting off incorrect parts of the veneer mat or by cutting the veneer mat at regular intervals into sheets of a certain width. In particular, the device is intended for a veneer cutting application in which a veneer mat to be cut from a log is split into two parts in the direction of travel of the veneer insofar as there are defects in the mat. The splitting is usually performed substantially in the middle. Following this procedure, the defects are removed independently from each of the non-veneer parts, while the intact carpet section is cut uncut across the entire width of the carpet to the specified dimensions.

Although said method saves veneer, as the defect-20 points rarely extend in the transverse direction of the veneer for a very large part of the mat, but place high demands on the cutting equipment. In the use of the procedure, several cutters are known to be used, i.e. two narrow cuts to cut the defect points of the veneer mat halves, and a full-length ____ cutter to cut the full veneer mat.

... A substantial improvement in said problem has been achieved by the invention in that the device 30 according to the invention makes it possible to provide both defect-point cuts of the veneer halves and full-length carpets. The device according to the invention is based on the so-called to the technique of a rotary blade cutter having a cutting blade extending beyond the veneer to be cut, which 35 is rotatably controlled to make cutting contact with the veneer at the desired cutting point. The rotational movement of the blade is chosen to yield a forward movement of the veneer, whereby the blade does not provide a stop yoke on the veneer at the time of cutting.

Usually, such a cutting blade cooperates with a roll or similar abutment member supporting the veneer mat, against which the blade presses through the veneer mat to effect cutting. The blade can be so massive in construction that it can make a cut. This solidity is achieved, for example, by adequate dimensioning of the blade axis. Alternatively, the cutting ball assembly 10 may have a support member on the side of the blade opposite the counter roll that provides support to the blade to provide cutting. With a lightweight blade, the rigidity of the blade can be increased by keeping the blade shaft in use under tensile stress.

15

According to the invention, such a blade element is divided in the axial direction into two successive sections, the rotation position of which can be controlled independently on the shaft.

The invention is illustrated by the accompanying drawing.

The figure shows a blade arrangement according to the invention, "comprising a shaft 1 extending over the entire width of the veneer to be cut and the two blade elements 2 'and 2" supported therein. split from below, in which case it has random defects in one of the two halves or also simultaneously in both halves, the blade elements 2 'and 2' 'cut the veneer mat halves independently of each other in order to cut off the defect points of their own halves.

-35

Once the veneer turning has progressed to the intact area of the log, the cutting of the veneer without incoming to the cutter is stopped and the controls of the blade elements 2 'and 2' 'are combined to obey the same command, which is usually cutting the veneer into sheet metal sheets. In this function model, the blade elements 2 'and 2 "are naturally aligned with each other and form a uniform, non-veneer-extending blade. In such a co-operation model, of course, extending-10 na as a strip with cooperating blade elements 2 ', 2' '.

Unlike the embodiment shown, the blade elements 2 'and 2' 'may, of course, also deviate from the two petals 2'a, 2'b, 2''a, 2''b, respectively, more than 15 petals, for example four petals evenly spaced on the shaft. One petal per blade element 2 'and 2' 'is also a functional solution.

Claims (5)

A device for cutting a veneer mat into sheets of a certain size and / or for removing defects on a shaft (1) with a guided rotatable, substantially veneer-free transverse cutting blade (2) rotatably in the direction of movement known to be rotatably in contact with the veneer the blade 10 (2) is formed in the axial direction (1) by two sections (2 ', 2' ') which are self-guiding, preferably extending half the width of the veneer. Device according to Claim 1, characterized in that each blade section has two blades (2'a, 2'b; 2''a, 2 "b) arranged opposite one another in relation to the shaft (1). Device according to claim 1 or 2, characterized in that the blade (2) is arranged to cut the veneer 20 against the support roll while resting on the upper support member. Device according to Claim 3, characterized in that the shaft (1) of the blade is subjected to a stiffening tension •: -j: 25. 4,87431 Device according to Claim 1 or 2, characterized in that the blade (2) is mounted on a solid shaft. (1) # which is dimensioned to provide the blade 30 with the support needed to make the cut. 5,87431