DE29608603U1 - Cutter head - Google Patents

Description

R4625/96
9 May 1996

Description

The invention relates to a cutter head for milling glued and unglued wood as well as chipboard and the like, with an essentially rotationally symmetrical support body, which has recesses on its circumference for accommodating a knife and a deflector, both of which protrude radially beyond the circumference of the support body. Such cutter heads are used for profile production.

In known cutter heads, a knife is connected to a deflector via a wedge-shaped spacer in such a way that the knife and the deflector run towards each other at an acute angle as the distance from the support body axis increases. The wedges formed from the knife, spacer and deflector are each inserted into wedge-shaped recesses in the support body and secured with retaining pins. The wedge shape is intended to ensure that the knives and the deflectors are not thrown away from the support body by centrifugal forces. It is also intended to enable efficient dissipation of the shear forces from the knife into the support body. However, with such a known cutter head, only a profile depth that is unsatisfactory in most cases can be achieved, because for stability reasons both the radial and axial profile projection must remain relatively small.

Based on this state of the art, the invention is based on the object of creating a cutter head of the type mentioned at the beginning, with which a greater profile depth and profile width can be achieved without compromising on work safety.

According to the invention, this object is achieved in that the recesses of the supporting body each consist of a separate knife slot for receiving the knife and a separate deflector slot for receiving the deflector.

hen, with the knife slot and the deflector slot converging at an acute angle with increasing distance from the support body axis.

The division of the individual wedge-shaped recesses into two separate slots increases stability and improves the hold of the blade and deflector in the support body compared to the state of the art, because the blades and deflectors are deeper and, above all, embedded in the support body on both sides. This also makes additional fastenings using pins or screws much safer and easier. The arrangement of the blade slot-deflector slot pairs, which converge at an acute angle, improves clean chip removal during milling and also increases the stability of the blades.

With the invention, with comparable dimensions of the supporting body, approximately double the values of the profile depth and profile width are possible compared to the state of the art.

Preferably, the knives are each seated in the knife slot together with a support plate on the one hand and a counter-pressure plate on the other. The support plate supports the knife, which allows the knife to be relatively thin. This is advantageous because the knife is usually made of expensive special steel. The counter-pressure plate on the other side of the knife also serves to absorb and transmit the forces that the material exerts on the knife during milling.

To fix the deflectors and the counter pressure plates, at least one clamping screw can be passed through the deflector slot into the knife slot. Such clamping screws fix the deflector in the deflector slot and at the same time prevent the counter pressure plate from slipping out of the knife slot due to the forces and torques that occur during milling. Since the clamping screws are each passed through the part of the support body that lies between a knife slot and a deflector slot, the forces absorbed by the clamping screws are passed directly and reliably into the support body.

It is particularly advantageous if the clamping screw axes form an angle α of less than 90 degrees with the respective counterpressure plate plane on the outside. This special geometry ensures that the counterpressure plate is particularly reliably secured against slipping out of the support body. Those force components that are not directly introduced into the support body from the counterpressure plate due to the design of the cutter head can thus be absorbed particularly effectively by the clamping screws and transferred to the support body.

The introduction of the forces acting on the counter pressure plate into the support body is further improved if the knife slot has a radially inner groove to accommodate the counter pressure plate.

The knives themselves are also conveniently fixed in the support body using retaining pins. These retaining pins primarily prevent the knife and, if applicable, the support plate from being thrown out of the support body; the forces exerted on the knife and the support plate by milling are largely transferred directly into the support body by the geometric arrangement of the knife slot.

In the further development of the invention with clamping screws and retaining pins, it is advantageous if the clamping screw seats and the retaining pin seats are arranged countersunk in the support body.

An embodiment of the invention is described and explained below with reference to the drawings.

Show it:

Figure 1 is a perspective view of a support body;

Figure 2 is a plan view of a knife head;

Figure 3 is a section along the line A-A of Figure 2;

Figure 4 is a section along the line B-B of Figure 2;

Figure 5 is a sectional view of a knife with support plate and

deflector;

Figure 6 is a view in direction X according to Figure 5;

Figure 7 is a view in direction Y according to Figure 5;

Figure 8 is a view in direction Z according to Figure 5;

Figure 9 shows a counterpressure plate in plan view;

Figure 10 is a section along the line C-C according to Figure 9.

Figure 1 shows a support body 1 of a knife head with a basic shape that is rotationally symmetrical about the support body axis 2. Distributed around its circumference, the support body 1 has three knife slots 3 and three deflector slots 4 assigned to the respective knife slots 3. In the knife slots 3 there is an axial groove 5 on the inside radially. The support body 1 is provided with countersunk retaining pin seats 6 and clamping screw seats 7 in the area of the knife slots 3 and the deflector slots 4. The parts of the support body 1 located between a knife slot 3 and a deflector slot 4 each have four through clamping screw holes 8.

Figure 2 shows a top view of the support body 1 from Figure 1. Three deflectors 9 are shown in broken lines, which are inserted into the deflector slots 4 of the support body 1. In each knife slot 3 there is a knife 10, a support plate 11 and a counter-pressure plate 12 - also shown in dashed lines. The support plate 11 and the knife 10 are fixed with a retaining pin 13. Using a partial section, Figure 2 shows that the angle α between the clamping screw axes 14 and the associated counter-pressure plate plane 15 is less than 90 degrees. The clamping screw seats 7 are recessed in the support body 1 by means of clamping screw recesses 16 and the retaining pin seats 6 are recessed in the support body 1 by means of retaining pin recesses 17. Finally, in Figure 2 the profile projection radius 18 of the knife head is indicated by a dot-dash circular arc.

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Figure 2 illustrates the geometry of a cutter head according to the invention, which ensures maximum stability of the cutter arrangement and thus enables an increased profile depth: The forces that act on the cutters 10 during milling from the material are introduced into the support body 1 on the one hand via the support plates 11 and on the other hand via the counter-pressure plates 12 on both sides. The counter-pressure plates 12 are held in place in the grooves 5 on the one hand and via clamping screws (not shown here) that are firmly anchored in the support body 1 on the other.

In Figure 3, a sectional view along the line A-A according to Figure 2, an inner wall of the deflector slot 4 in the support body 1 is visible. In this illustration it is clear how the clamping screw seats 7 are countersunk in the support body 1 by means of clamping screw recesses 16. Four clamping screw holes 8 can be seen in the deflector slot 4.

Figure 4 shows a section along the line B-B according to Figure 2. Here, the inner wall of a knife slot 3 with the adjoining groove 5 is shown. The retaining pin seats 6 are countersunk in the support body 1 by means of retaining pin recesses 17. The retaining pin holes 19 reach into the knife slot 3.

Figure 5 shows the arrangement of a knife 10, a support plate 11 and a deflector 9 in section on the same scale as in Figure 2. Clamping screw holes 20 lead through the deflector 9. In addition, a retaining pin hole 21 leading through the knife 10 and an adjoining retaining pin hole 22 leading through the support plate 11 can be seen. φ indicates the angle at which the knife 10 and the deflector 9 converge towards one another in their installation position with increasing distance from the support body axis 2.

Figure 6 shows a view in direction X according to Figure 5, showing the support plate 11 with the retaining pin holes 22 passing through it.

Figure 7, a view in the direction Y according to Figure 5, shows a top view of the knife 10 with the retaining pin holes 21 leading through it. The installation position of the counter pressure plate 12, which is not shown in Figure 5, is indicated with dashed lines.

Figure 8 is a view in the direction Z according to Figure 5 and shows a top view of a deflector 9 with its clamping screw holes 20.

Figure 9 shows a top view of the counter pressure plate 12. The clamping screw holes 23 can be seen, into which the clamping screws (not shown) engage.

Figure 10 is a sectional view along the line C-C according to Figure 9. It illustrates how the clamping screw holes 23 are located in the counter pressure plate 12: The clamping screw axes 14 are inclined in such a way that they each enclose an angle α with the counter pressure plate plane 15 that is less than 90 degrees.

R 4625/96 9 May 1996

List of reference symbols

1 supporting body

2 Support body axis

3 knife slots

4 Deflector slot

5 grooves

6 Retaining pin seat

7 Clamping screw seat

8 clamping screw hole (in 1)

9 Deflectors

10 knives

11 Support plate

12 Counter pressure plate

13 Retaining pin

14 Clamping screw axis

15 Counter pressure plate level

16 Clamping screw recess

17 Retaining pin recess

18 Profile projection radius

19 Retaining pin hole (in 1)

20 clamping screw hole (in 9)

21 Retaining pin hole (in 10)

22 Retaining pin hole (in 11)

23 Clamping screw hole (in 12) cc angle

φ angle

Claims (7)

PATENT ATTORNEYS: 'g^ EUROPEAN VAT A*TTOR*NEYs' FELIX-MOTTL-STRASSE 1A D-76185 KARLSRUHE TELEPHONE (0721) 85 33 55 R4625/96 9 May 1996 Romi-Technik Werkzeug- und Maschinenhandels GmbH Knife head Protection claims 1. Cutter head for milling glued and unglued wood as well as chipboard and the like, with a substantially rotationally symmetrical support body (1) which has recesses on its circumference for receiving a deflector (9) and a knife (10) each, both of which protrude radially beyond the circumference of the support body (1), characterized in that the recesses of the support body (1) each consist of a separate knife slot (3) for receiving the knife (10) and a separate deflector slot (4) for receiving the deflector (9), the knife slot (3) and the deflector slot (4) converging towards one another at an acute angle (φ) with increasing distance from the support body axis (2). 2. Knife head according to claim 1, characterized in that the knives (10) are each seated in the knife slot (3) together with a support plate (11) and a counter-pressure plate (12). · 3. Knife head according to claim 2, characterized in that for fixing the deflectors (9) and the counter-pressure plates (12) at least one clamping screw is guided through the deflector slot (4) into the knife slot (3). 4. Cutter head according to claim 3, characterized in that the clamping screw axes (14) enclose an angle α with the respective counter-pressure plate plane (22) radially on the outside, which is smaller than ninety degrees. 5. Knife head according to one of claims 2 to 4, characterized in that the knife slot (3) has an internal groove (5) for receiving the counter-pressure plate (12). 6. Knife head according to one of claims 1 to 5, characterized in that the knives (10) are fixed by means of retaining pins (13). 7. Cutter head according to claim 6 and one of claims 3 to 5, characterized in that the clamping screw seats (7) and the retaining pin seats (6) are arranged countersunk in the support body (1).