DE2501936B1

DE2501936B1 - Table adjustment for wood veneer cutting machine - rotary component reduces displacement while retaining slicing knife-cut

Info

Publication number: DE2501936B1
Application number: DE19752501936
Authority: DE
Inventors: Dieter Keck
Original assignee: C Keller GmbH and Co KG
Current assignee: C Keller GmbH and Co KG
Priority date: 1975-01-18
Filing date: 1975-01-18
Publication date: 1976-01-15
Also published as: DE2501936C2

Abstract

The log to be cut froms the base of a triangle whose apex is constrained to move in a circle while the mid-point of the base remains at a fixed distance via a rod from a fixed point. The resulting motion carries the log obliquely past the cutting knife in a twisting movement which advances one end of the log first, then reverses to bring the log almost straight again. The oblique presentation ensures that the wood is drawn along the knife, while the double rotation involves less linear displacement than is needed when the log maintains a fixed (oblique) direction.

Description

An der Unterseite des Spanntisches 9 ist ein Zapfen 14 befestigt, der mit einer Stange 15 gelenkig in Verbindung steht. Die Stange 15 wiederum ist im Punkt 16 gelenkig am Unterbau 6 befestigt und hat die Aufgabe, den Spanntisch 9 während der hin- und A pin 14 is attached to the underside of the clamping table 9, which is connected to a rod 15 in an articulated manner. The rod 15 in turn is at point 16 articulated to the substructure 6 and has the task of the clamping table 9 during the back and forth

hergehenden Bewegungen zu führen.to lead forward movements.

Durch die Drehbewegung der Drehscheibe 7 in Richtung des Pfeiles A wird der Spanntisch 9 und damit auch der auf ihm liegende Holzstamm 13 unter dem Mittelbau entsprechend entlanggeführt. By rotating the turntable 7 in the direction of the arrow A is the clamping table 9 and thus also the log 13 lying on it under the Central structure led along accordingly.

Bevor der Schnitt beginnt, liegt die Kante M des auf dem Messerbalken 4 befestigten Messers in der in F i g. 2 dargestellten Stellung. Before the cut begins, the edge M of lies on the cutter bar 4 attached knife in the in F i g. 2 position shown.

Sobald die Drehung der Drehscheibe 7 in Richtung des Pfeiles A beginnt, nimmt der Spanntisch 9 und damit auch der auf ihm liegende Holzstamm 13 eine infolge der Führung durch die Stange 15 bewirkte Schräglage gegenüber der Messerkante M ein, so daß die Messerkante Mschräg in den Holzstamm 13 eindringt. As soon as the rotation of the turntable 7 begins in the direction of arrow A, takes the clamping table 9 and thus also the log 13 lying on it a result the guide through the rod 15 caused inclination with respect to the knife edge M. so that the knife edge M penetrates the log 13 at an angle.

Je weiter die Drehung der Drehscheibe 7 in Richtung des Pfeiles A erfolgt, desto schräger stellt sich der Spanntisch 9 bzw. der Holzstamm 13 in Hinsicht auf die Messerkante M ein. Die größte Schräglage des Spanntisches 9 bzw. des Holzstammes 13 tritt bei der in F i g. 3 dargestellten Lage der Drehscheibe 7 ein. The further the rotation of the turntable 7 in the direction of arrow A. occurs, the more inclined the clamping table 9 or the log 13 is in terms of on the knife edge M. The greatest inclination of the clamping table 9 or the log 13 occurs in the case of FIG. 3 position of the turntable 7 shown.

Während dieses Schnitthubes hat sich also die Schräglage des Spanntisches 9 und damit auch des Holzstammes 13 gegenüber der Messerkante Mlaufend verändert, so daß hier von einem vollkommen ziehenden Schnitt gesprochen werden kann, wobei zusätzlich eine Taumelbewegung des Holzstammes 13 erreicht wird.During this cutting stroke, the inclined position of the clamping table has changed 9 and thus also of the log 13 compared to the knife edge Mlaufend changed, so that here one can speak of a completely pulling cut, whereby additionally a tumbling motion of the log 13 is achieved.

Bei weiterer Drehung der Drehscheibe 7 in Richtung des Pfeiles A wird der Spanntisch 9 bzw. der Holzstamm 13 aus der Schräglage allmählich wieder in die Parallellage zur Messerkante M( F i g. 4) zurückgeführt, derart, daß kurz vor Ende dieser Hubbewegung die Messerkante M schräg, und zwar mit etwa 5° aus dem Holzstamm 13 austritt Nach dieser Hubbewegung hat das am Messerbalken 4 befestigte Messer vom Holzstamm 13 ein Furnierblatt abgemessert, so daß sich die Drehscheibe 7 wieder zurück in die Ausgangsposition, wie in Fig. 3 dargestellt, bewegt und anschließend einen neuen Schnitt beginnt. With further rotation of the turntable 7 in the direction of arrow A. the clamping table 9 or the log 13 from the inclined position is gradually restored returned to the parallel position to the knife edge M (Fig. 4), so that short before the end of this stroke movement, the knife edge M at an angle, namely with about 5 ° from the Log 13 emerges After this lifting movement has been attached to the cutter bar 4 Knife from the log 13 cut a sheet of veneer so that the turntable 7 back to the starting position, as shown in Fig. 3, moved and then a new cut begins.

Der Messerbalken 4 wird nach einem jeden Schnitt über die Schlitten 3 auf das neu zu schneidende Furnier eingestellt. The cutter bar 4 is over the carriage after each cut 3 adjusted to the new veneer to be cut.

Aus den Fig. 2 bis 4 ist deutlich zu sehen, daß der Hub des Spanntisches 9, abgestimmt auf die Breite des Holzstammes 13, klein gehalten werden kann, da eine Schräglage des Spanntisches 9 bzw. des Holzstammes 13, um ein Eindringen des Messers in den Holzstamm 13 zu erleichtern, vor Schnittbeginn nicht erforderlich ist, sondern erst dann eine Schräglage des Spanntisches 9 bzw. des Holzstammes 13 eintritt, wenn der Schnitt bzw. From Figs. 2 to 4 it can be clearly seen that the stroke of the clamping table 9, matched to the width of the log 13, can be kept small because an inclined position of the clamping table 9 or the log 13 to prevent the penetration of the To facilitate the knife in the log 13, not required before starting the cut is, but only then an inclined position of the clamping table 9 or the log 13 occurs when the cut or

die Drehung der Drehscheibe 7 in Richtung des Pfeiles A begonnen hat the rotation of the turntable 7 in the direction of arrow A started Has

Claims

Claims: 1. Veneer cutting machine with horizontal working movement, with the clamping table, which receives the log and slides on a substructure, underneath a vertically displaceable central structure supporting the cutter bar and pressure bar Can be moved back and forth, characterized in that the clamping table (9) is over a triangular connection with only one turntable (7) as a drive device for the same is articulated and that the clamping table with one on the substructure (6) attached rod (15) is in connection, which the clamping table in the back and forth accompanying lifting movement leads.

2. Veneer cutting machine according to claim 1, characterized in that that the triangular connection consists of two individual rods (10 and 11) or from one There is triangular shaped sheet metal, with a base side of the triangular connection firmly with the clamping table (9) and the tip of the triangular connection articulated with the turntable (7) is connected.

The invention relates to a veneer cutting machine with a horizontal Working movement, with the one that picks up the log and slides on a substructure Clamping table under a vertically movable, the cutter bar and the pressure bar load-bearing central structure is movable back and forth.

The DT-OS 16 53 086 shows a veneer cutting machine of this type, wherein the clamping table carrying the log is under a vertically displaceable one Central structure can be moved back and forth and has two synchronously rotating turntables is articulated. With this veneer cutting machine, the direction of the Side guide track of the clamping table something, z. B. about 5 °, from the vertical to from the central structure supporting the pressure bar and the cutter bar in order to do this to get a pulling cut of the knife in the log as the one on the clamping table fortified log is inclined in relation to the central building. This inclination requires a relatively long stroke of the central structure. So is z. B. at a Log width of 800 mm and a log length of 4000 mm a stroke of approx 1200 mm required. This known device therefore does not lead to a satisfactory one Power. Also the arrangement of two turntables and the required lateral guideway very complex for the clamping table.

The object of the invention is therefore to provide a veneer cutting machine to develop the type mentioned at the beginning so that the clamping table while maintaining the effect of the pulling cut of the knife in the log compared to the known Device with reduced stroke and with increased performance as well as with only in proportion can be performed with little structural effort.

This object is achieved according to the invention in that the clamping table via a triangular connection with only one turntable as a drive device for the same is articulated, and that the clamping table is attached to a substructure Rod is connected, which the clamping table in the reciprocating lifting movement leads.

The advantage here is that the stroke is about 20% smaller and a tumbling motion by the rod connected to the clamping table of the clamping table is generated.

As a result, the clamping table, and with it the log, take the cutting movement a sloping position in relation to the central building, which is constantly changing during the cut changes so that there is a pulling cut of the knife in the log.

By guiding the clamping table by means of the rod at the rear and reciprocal lifting movements, lateral guide tracks for the clamping table are unnecessary.

Another advantageous embodiment of the invention still exists in that the triangular connection consists of two individual rods or of one triangular formed sheet metal, with a base side of the triangular connection firmly with the Clamping table and the tip of the triangular connection are articulated to the turntable is.

An embodiment of the veneer cutting machine according to the invention is explained below with reference to the drawing. This shows in a purely schematic Way F i g. 1 a view of the veneer cutting machine partly in longitudinal section, F i g. 2 shows a plan view of the veneer cutting machine along the line 11-11 in Fig. 1, Fig. 3 and 4 further plan views corresponding to FIG. 2, however in different operating positions.

The veneer cutting machine consists of two mirror images of each other same side stands 1, -in which along a guide track 2 each have a slide 3 is arranged vertically displaceable. There is a cutter bar on the two sledges 4 and a pressure beam 5 mounted, which extends over the space between the two Extend side stand 1 and be designated net with central structure.

The side stands 1 are each anode ends of a substructure 6 attached, which carries on one side a circular turntable 7, which in her Center is rotatably mounted in a bearing 8.

On the side of the substructure opposite the turntable 7 6, a clamping table 9 is slidably arranged, which by means of rods 10 and 11, which on Clamping table 9 are attached, with the turntable 7 is articulated. Instead of the rods 10 and 11 can also be a triangular-shaped sheet metal. The articulated connection of the rods 10 and 11 or the triangular shaped sheet with the turntable 7 takes place via a pin 12 which is arranged on the turntable 7 is.

The clamping table 9 is used to hold the log to be cut 13th

The log 13 is on the clamping table 9 via not shown Clamping claws or held by the negative pressure generated in the clamping table 9.

For this purpose, the clamping table 9 has the shape of a hollow profile with a suction chamber that is placed under negative pressure. Over the entire clamping table 9 distributed holes are provided, which start out from the suction chamber to the outside extend and hold the log 13 on the clamping table 9.