This invention is concerned with an extending device -for wood-veneer that comprises a c am-ferinα unit to cham-fer veneer edges, a pressing apparatus -for holding and a glueing unit.

With known extending devices the cham-fering o-f the veneer edges to be joined, the application o-f glue onto the cham-fered sur-face, the positioning o-f the cham-fered sur-faces on each other and the pressing of the glue joint are each done in separate units, which make the device longjsh, complicated and therefore also slow in carrying through all the operations. With present equipment, positioning the chamfered veneer edges into a press onto each other is liable to faults, especially if the veneer material is of poor quality.

Present chamfering methods are based on two chamfering blades that are at a fixed distance from each other. Therefore, the chamfered veneer is always constant in size. In practice, this causes loss of material, as the distance between the blades must be adjusted in accordance with the shortest veneer wor piece.

The object of this invention is to provide a new type of extending device for wood—veneer where all the above-mentioned operations are integrated at one and the same location in the extending device. An extending device based on the invention is

characterized by that the rear e αe of the veneer to be extended and the front edαe of the new veneer are positioned by means of the pressmq apparatus in such a way that the chamfering unit, running between them and comprising e.g. a circle saw, cuts both of the edges, after which the application of glue and pressing together follows- When, through this invention, the veneer ends that are to be joined are in such a way chamfered, provided with glue, and pressed that the edges of the veneers stay in the same presses for the whole operation, absolute precision is achieved in respect to the form and positioning of the chamfers and any tearing of the veneer edges due to additional moves is avo ded.

An advantageous application of the invention is characterized by that the pressing jaw holding the front edge of the new veneer can together with the veneer be moved along a track against the other veneer and produce compression for the pressing and glueing together of the chamfered edges thus positioned on each other. Consequently, the glueing together of the edges of the veneers goes very quickly', and when, moreover, a rapidly fixing glue < 'hot melt') is used, it is possible to immediately start the next cycle.

Another application of the invention is characterized by that in the chamfering unit there is a glueing unit that in connection with chamfering applies the glue at least onto one of the two

chamfers. This way, the glue can be applied at the same time as the saw= cut the edαes of the veneers. After this the only thing to do is to move the front edge o-f the new veneer onto the rear edge of the veneer to be extended and press the joint together. As a whole, the device is small, simple and very fast.

A third application of the invention is characterized by that on the shaft of the circle saw there are, one over the other, two circle—saw blades, one of which saws the rear edge of the veneer to be extended and the other the front edge of the new veneer. Thereby, it is possible to handle two sawings with one and the same motor, and the angle of the chamfer can be adjusted by changing the distance between the blades.

Below, the invention is described by means of an example, with reference to the enclosed drawings where

Figure 1 shows, partly cut, the extending device for veneer from the side.

Figure 2 shows the chamfering unit from above.

Figure 3 shows a section cut along the line III—III in Figure 2,

Figure 4 shows the ends of the cut veneers before they are glued together,

Figure 5 shows the ends of the veneers pressed together.

The extending device for wood-veneer comprises a chamfering unit 1 to chamfer veneer edges, a pressing apparatus 2, 3 for holding and a glueing unit 4. The rear edge of the veneer 5 to be extended and the front edge of the new veneer 6 are positioned by means of the pressing apparatus 2, 3 in sucn a wav that the chamfering unit 1, running between them ana comprising a circle saw, cuts both of the edges at the same time, after which the application of glue and pressing together follows. The pressing jaw 2 holding the front edge of the new veneer 6 can together with the veneer 6 be moved along a track 7 against the other veneer 5 and produce compression for the pressing and glueing together of the chamfered edges thus positioned on each other. In the chamfering unit 1 there is a glueing unit 4 that in connection with chamfering applies the glue onto the chamfered edge of the veneer 5 to be extended. On the shaft of the circle saw 1 there are, one over the other, two circle-saw blades 6, 9, one of which -saws the rear edge of the veneer 5 to be extended and the other the front edge of the new veneer έ>.

It is obvious to a professional that the invention is not confined to the example presented above but can vary within the framework of the patent claims presented below.