DE1653061B - - Google Patents

Description

To produce wood chips of as constant a thickness as possible, The interchangeable cutting inserts with the knives are always exactly the same Assume position with respect to the shaft body.

According to the invention, this object is achieved by that the clamping screw from the outside through the recess inclined forward in the circumferential direction through obliquely to the plane of which is screwed into the ring inside and on the cutting insert / via a provided on this, at right angles to the Schnuibentiehsc engages lying surface in such a way that the cutting insert has a first force component jiegcti one provided at the bottom of the recess Abutment and by a second force component via the chip knife against the inner side surface tier recess can be clamped.

Here, even shorter pieces of wood in the area of the knife edges and the flutes are reliably cut off on the circumference of the laterally adjacent rings. The pocket shape de. Recesses in the shaft circumference are only formed in a small angular range by the cutting inserts, but otherwise directly by the ring body. The parts of the ring body lying over the pockets are also not exposed to any deformation tensioning claws, so that the cylindrical circumferential surface of the knife can be adhered to very precisely and the wood to be machined can be held against this circumferential surface with great uniformity. In addition, the clamping screws are arranged in such a way that the cutting inserts are clamped against two contact surfaces which are at right angles to one another. The greatest tension force is exerted in the usual way on one side surface of the recess and the other on a counter-bearing surface on the recess base. Elaborate prismatic surfaces are here: rmicdcn. Precisely for this reason, a high degree of accuracy in the setting is achieved. On all exchangeable cutting inserts, the chip cutter always occupies the same position in relation to the circumference of the shaft. In addition to the exact adjustability of the knife edges, there is therefore the exact guidance of the wood at the Wclletiumfang, which d ^; E results in the desired uniform span thickness.

The cutting insert preferably lies with one end face on two separate ones in the base of the recess support bodies attached as abutments in the. These support bodies are easier to grind in ills a continuous surface and thus improve «Lic alignment and at the same time also the running groove «Ler wave.

A further improvement of this lay-out is achieved by shifting the cutting rates in the axis alignment by half an extent. After every half of the t'mfangstciliing a set of knives comes to the tingrilf, the knives of which are attached to every second ring. It is true that the swelling and swelling of the individual cutting forces is greater than in the case of fine cutting. However, these changes in force cannot appear significantly, since the cutting inserts arranged in four to five jacket lines are always in engagement. The forces occurring here remain evenly distributed over the length of the shaft and do not shift in its axial direction. The hereby crzidte running again contributes to a Verglcichmäßigung the Spandickc.

According to a further proposal of the invention, the recesses are alternating in the direction of rotation molded in from both ends approximately to the center of the ring. Therefore always remains on one ring side keep at least half a ring. Man comes out here with a relatively low ring weight, since in the formation of the recesses almost the entire ring cross-section can be used and yet the freely protruding lips od. The like. Are supported at the end of the other ring half and are therefore less than with individual rings can deform. As a result, the circular shape of the circumferential surface is improved, as a result of which the Improve the uniformity of the wood system and the chip thickness as well as the smoothness.

Finally, it is proposed according to the invention, the recesses in the rings and the tension lines in the circumferential direction in a known manner Way to just over-snow -. / N. The chips and any resulting splinters can then do not clamp, as their total length is less than the length of the flute. So I can do it No additional forces are exerted by the cutting area and the chip thickness from the chip flow influence.

Details of the invention are based on a preferred embodiment shown in the drawing explained in more detail in the description. It shows

Fig. 1 is an end view of an inventive Knife shaft,

FIG. 2 shows the knife shaft according to FIG. 1 in a plan view and

FIG. 3 shows a detail from the front view of the knife shaft according to FIG. 1.

The shaft body 1 is formed from rings 2, which give away with mutual centering rings 3 and are positively connected to one another by the tie rods 4. Cutting inserts 5, in which clamping tools 6 and these downstream cutting tools 7 are located, are fastened in the recesses 8 of the rings 2. In front of each recess 8, which in each case extends to just above the ring center shown by the line aa , a corresponding, somewhat wider flute 9 is provided, next to which a wide wood filler piece 10 is present.

The clamping screws screwed into the ring 2 run approximately radially in each recess 8. she acts with its head 12 through the bore 13 in the ring jacket on the surface 14 in the cutting insert 5, the one with its end face 15 of two spacers 16 is supported at the bottom of the recess C. The chip knife 6 is located between the cutting insert 5 and the designated 17 wall of the recess 8 and is under the action of eggs Clamping screw II. The clamping knife 6 is attached to the Cutting insert 5 by means of the screw 18, which reach through the elongated holes 19 of the cutting insert. The screw 20 serves to fasten the scoring knife 7 in the cutting insert 5 Interposition of the pressure piece 21.

Scoring and chip knives are exactly one outside of the machines with respect to surface 15 predetermined dimension and can be adjusted in this position by tightening the screws 20 and

18 can be set. The cutting insert is then only to be inserted into the recess 8 and through Tighten the screw 12 to tighten. In doing so, the chip knife is once directly against the wall 17

the recess 8 and on the other hand the surface IS by means of a second force component of the screw 12 printed against the spacers 16 attached to the bottom of the recess. Since the contact areas for 15 can be ground in very precisely, especially the chip knife has exactly the same position in with respect to this contact surface. It can therefore be the cutting inserts in any number of different recesses Rings are used without sicli thereby affecting the position of the cut edge or the flying circlet the knife changes significantly.

Narrow recesses 8 are sufficient, especially in the case of the double ring arrangement shown arranged close to one another in the circumferential direction which enables high cutting frequencies at a given speed.

1 sheet of drawings

Claims (5)

J 2 patent claims · Comb knife cutting inserts are fitted, which are attached to the 1. Knife shaft for wood cutting machines, shaft body to be clamped. Such knife whose wave body from several mutually waves have been used for the machining of round and jentrierte and positively 5 logs by tie rods. Mainly formed in the case of Zerjerbundenen rings, the pocket-chips of short thin pieces of wood can, however, have cutouts on these, in which, as is known, a uniform chip thickness cannot be achieved. This is mainly because the centrifugal tensioning screws are fastened there, which means that the force tension does not indicate a completely exact alignment that the tensioning screw (11) allows the knife edge to the shaft circumference and the blown outside through the circumferential direction over or next to the cutting inserts lying jorn inclined recess (8) through oblique lips or the like of the shaft body are deflected or deformed by the clamping Iu the plane inside the ring (2) so that the I is screwed and on the cutting insert (5) a shaft circumference becomes out of round. There is therefore also no more uniform contact of the wood possible at right angles to 15, the surface (14) lying on the screw axis attacks, which leads to uneven machine operation and again to such an extent that the cutting insert leads over a first uneven chip thickness.
Force component against an abutment at the bottom of the known is also the use of narrow recess provided abutment (at 16) and knife shaft rings, the knives of adjacent ones being offset from one another in the circumferential direction by a second force component over the 20 rings. Chip knife (6) against the inner side surface (17) In this case, the wood can be spambar on the side of the recess during the cut. Perimeter of the neighboring rings are supported. Out 2. Knife shaft according to claim 1, characterized in that the relevant prior publication is not indicates that the cutting insert (5) also shows how the knives in this version are shown in an end face (15) to be attached to two separate rings in the 25. Another known knife shaft is made up of several brought Stülzkkörpers (16) is applied. composed of thin »milling disks«. Are there 3. Knife shaft according to claim 1, characterized in that the knife approximately tangentially on the outside of the shaft indicates that you are attached to the circumference in Ar ^ senrichtung. When milling, however, it is necessary to turn the cutting inserts (5) around half a turn for the knives to cut freely, 4. Knife shaft according to claim 3, which wants to produce chips of different thicknesses. There it is therefore indicated that the recesses (8) are not formed in either a uniform support of the wood in the direction of rotation alternating from the two end shaft circumference, nor can they only be formed as far as the ring die (aa) . 35 chips of almost the same thickness can be achieved. 5. Knife shaft according to claim 3 or 4, there are also known knife shafts with one-piece characterized in that the recesses (8) shaft body and through in over the entire wavelength the rings (2) and the chip knives (6) are running chip knives, which are in interchangeable cutting inserts are clamped in a manner known per se in Umlaufrichtiing. The essentially scarce overlap. 40 borrowed flutes are also there by lying in the flight circle behind the scoring knives narrow webs divided. A support on the side next to the interface is not possible and the in The invention relates to a knife shaft for wood webs provided for the chip flutes can only be used when tcrspanungsmasehincn, whose corrugated body consists of 45 cutting of round and split logs, but not of • teach mutually centered logs of wood that are smaller due to tie rods an approximately sufficient one positively connected rings is formed that result in support. In addition, neither are these webs have pocket-like recesses in which .inch any other parts of the shaft circumference Schnciclcinsätzc with scoring and chip knives arranged directly on the body. The toilet clamping screw are attached. 50 circumference is only used by parts of the cutting Measuring shafts of this type are mainly made for use. The wood can therefore, if only for that reason Production of wood chips for the chipboard- no safe guidance is obtained because it is constantly over Used in industry. To ensure that the segment surfaces of individual parts of the To obtain particle board, it is necessary that Schnculcinsätzc is running. These parts are also about • There are numerous prismatic and other stop surfaces at least in the cover layers 55 of wood chips have approximately the same thickness. In the wooden on the shaft body and supported on each other. she Cutting machines can be made by screws that are approximately perpendicular to the thickness Chips - · expressed by a favorable chip plane of the chip knife act, one above the other on distribution curve - only achieved if the wood shaft body is clamped tight. This arrangement is consistently precisely supported on the circumference of the shaft ^ o not only expensive, but due to the numerous and if the cutting edges of all the cutting blades interacting contact surfaces are overdetermined, so the same board of directors opposite to the one to tear that neither the flying circle of the chip knife engages The wood-supporting coat of the wavy can still be determined consistently body, so all offered the same cutting circle bc-cylindrical contact surface for the wood to write. 65 can be. In a known knife shaft of the initially gc- object of the invention, on the other hand, a described genus rings are used to create a knife shaft of the kind explained, which it Width of ctwp. 3 to 400 mm and made possible with, even from relatively short and thin ones