DE1092761B - Lower knife shaft for cutting webs of paper, cardboard, plastic, fabric or the like. - Google Patents

Description

If the cutting tools sitting on a lower cutter shaft have become blunt and that's why have to be replaced or reground, then the shaft has to be in most designs removed from the cutting machine. In addition, it is then necessary to all between the unusable Knife and the other knife, intermediate rings, etc. located at one end of the shaft from the shaft deduct. This results in a considerable loss of time. To avoid this significant disadvantage one has already used knives that consist of two halves, which after loosening their connecting parts of the shaft can be removed without it having to be removed. Such knives must but must be worked very precisely because otherwise the two joints between the knife halves would be unfavorable affect the cutting process. Because of the precise machining, they are very expensive to manufacture.

Steel ring disks have also become known as cutting tools for lower cutter shafts consist of one piece, but are split at one point. You can twist the the shaft can be removed without it needing to be removed, and thus also avoid the disadvantages mentioned at the beginning.

The invention makes it possible to produce cutting rings in the form of steel ring disks, which are neither divided are still split, to use on lower cutter shafts and still replace the rings without that the shaft must be expanded. This is achieved by having several for each cutting point Steel ring disks are arranged on the shaft, of which only the steel ring disks adjacent to a cutting groove Serve as a circular knife, while the rest of the used circular knife and its Shifting on the shaft one after the other can be used as a circular knife. The lower knife shaft can be filled with one or more intermediate rings between the individual cutting points, and all steel ring disks and intermediate rings can in the usual way in the axial direction of both Sides are braced.

So that it is possible to move one or more steel ring disks on the shaft, the Intermediate rings or a part of the same formed in two parts in a known manner, so that they are easily from the built-in shaft can be removed. A worn steel washer can therefore be removed after it has been removed of the intermediate ring adjacent to it over its bearing point be moved on the shaft, causing them to move after the intermediate ring has been replaced on the other side of the same and thus ineffective, while the previously adjacent Steel ring disc is in the cutting position.

Lower knife shaft for cutting

of sheets of paper, cardboard,

Plastic, fabric or the like.

Applicant:

Maschinenfabrik Goebel GmbH,
Darmstadt, Goebelstr. 21

Helmut Antel, Darmstadt,
has been named as the inventor

It is advisable to use the steel ring disks provided for later use at each cutting point to be arranged next to the unused side surface of the steel ring disk in engagement with the upper knife, all of these steel ring disks sit directly next to one another on the shaft. The for the Engagement of the upper knife required groove can be formed by the fact that the cutting Circular knife adjacent two-part intermediate ring on the side facing the lower knife a shoulder has a smaller outer diameter. However, it is also possible right next to this knife to put a narrow two-part ring on the shaft, the outer diameter of which is smaller than the Outside diameter of the circular knife.

An embodiment of the inventive concept is shown schematically in the drawing.

Fig. 1 is a longitudinal section through an undercutter shaft;

Fig. 2 shows the same bedknife shaft after the worn cutting rings have shifted onto it have been;

Fig. 3 shows the two parts of an intermediate ring consisting of two parts;

Fig. 4 shows the same parts in the assembled state.

The lower cutter shaft 1 has paragraphs at both ends, of which paragraphs 2 and 3 are threaded, while the other paragraphs 4 and 5 are used for storage. On the shaft are the one-piece intermediate rings 6, 7, 8 and 9 and the two-part intermediate rings 10, 11 and 12, which differ from the undivided intermediate ring in the drawing in that they are not hatched.

009 647/274

In the embodiment it is assumed that the web running over the lower cutter shaft at three Places to be cut. These cutting points are indicated by the upper knife indicated by dashed lines. Each upper knife works with one steel ring disc, which is designated by 13, 14 and 15 are. Immediately next to these steel ring disks there are further steel ring disks completely of the same type and size, which are directly adjacent to one another with their side surfaces. All The intermediate rings and steel ring disks located on the shaft are thus firmly in their correct position Held in a position that they between the two nuts 16 and 17 are clamped. The lower knife shaft is ready for operation in this state.

The intermediate rings 10, 11 and 12 used in connection with the invention can be of any be known construction. It is only required that it be easily removed from the shaft and can be put back on them. Since they serve as a guide for the web to be cut, they must also have a circumference that is as uniform as possible, the diameter of which corresponds to the outside diameter corresponds to the cutting rings. For example, they can be designed as shown in Figs. 3 and 4 is indicated, which show a view of one of the two joints between the two ring halves.

Both ring halves 18 and 19 encircle the shaft at an angle of 180 °. On both of their abutting edges is the ring half 18 with a respective approach 20 and the ring half 19 with a slightly larger one Recess 21 provided. When the two halves of the ring are so offset from one another as it is shown in Fig. 3, then the lugs 20 can penetrate into the recess 21 until the two sides Touch edges. If they are then shifted to one another in the axial direction, then take them they finally enter the position shown in Fig. 4 and form a closed ring, which in this position cannot be taken apart. If the two ring halves sit in this position on the shaft and they are secured by the two nuts 16 and 17 together with the remaining intermediate rings and steel ring washers braced on it, then they cannot detach from the shaft. A dismantling of the two ring halves is only possible again when one of the two is screwed back Nuts 16 and 17 so much axial play arises on the shaft that after the axial displacement of the two Ring halves to one another, the lugs 20 can be pulled out of the recesses 21.

If after a certain period of operation the steel rings 13, 14 and 15 have become blunt and need to be replaced, then one of the two nuts 16 or 17 will be around screwed back a little bit, so that one of the intermediate rings, for example the intermediate ring, is at first 10, can be removed. Then the washer 13 is moved to the left on the shaft, until it rests against the intermediate ring 6. This creates space for removing the intermediate ring 11 be that with the intermediate ring 10 removed, the ring 7 is pushed slightly to the left. After the intermediate ring 11 has been removed, the cutting ring 14 can then likewise to the left against the ring 7 be pushed. The same is repeated after removing the intermediate ring 12 with the cutting ring 15. Then the intermediate rings can be put back on and joined together one after the other and finally The lower cutter shaft is then occupied as shown in Fig. 2. Here are the ones used before Cutting rings 13, 14 and 15 ineffective, while the previously unused cutting rings 22, 23 and 24 now assume the cutting position. The shaft is now at the cutting points with new cutting rings occupied without it having to be expanded in between.

The arrangement of the cutting ring packages and the

ίο Intermediate rings on the shaft must of course be adapted to the respective conditions, in particular the strip width to be cut. Intended to for example, the strip width can be changed while maintaining three cutting points, then this can be done, for example, in that instead of the divided intermediate rings 10, 11 and 12 intermediate rings be placed on the shaft of a different length. If, on the other hand, the train should be in more than three places are cut, then that can only be through

ao achieve an expansion of the shaft when the shaft is occupied as the embodiment shows. In order to avoid this, however, one can occupy the wave from the outset in such a way that it is the largest desired Number of strips can be cut. So that would mean a corresponding number is applied to the shaft by cutting ring packs. If so, a smaller number of strips is to be cut, then some cutting ring packages run along empty, which, however, the cutting process not affected.

In rare cases it can happen that only one of the steel ring disks is blunt or unusable has become and must therefore be replaced. Even if the individual steel ring disks are very thin are, the replacement causes a change in the width of the stripe, which is not always within the required tolerance. In such cases it is necessary to replace the intermediate rings the original against those with a small size or by inserting a thin additional ring Strip width is restored.

In the embodiment described, it is assumed that each split intermediate ring with one Paragraph is provided which forms the cutting groove for the engagement of the counter knife. As already mentioned, However, the cutting grooves 25, 26, 27 can also be formed in that between the in action located cutting rings and the next intermediate rings, another intermediate ring is placed on the shaft whose width corresponds to the groove width, but which has a smaller diameter than the Cutting ring. In such an embodiment, for example, the cutting ring 13 is not replaced by that it is pushed against the intermediate ring 6, but it is against the side surface of the then stepless intermediate ring 10 pushed after the intermediate ring forming the groove beforehand has been removed, which is then placed back on the shaft in the usual way.

If the cutting rings are replaced in the manner described so far, then only one side of each washer is used as a cutting surface or as a cutting edge. In order to the other surface of the ring disks can also be used for cutting, these must be at an occasional dismantling of the shaft can be placed on the shaft in reverse.

The use of the other cutting surface or edge is within the scope of the invention also without

their storage are adjustable so that they can cut both to the left and to the right. For example, if they cut to the right, as shown in Fig. 1, then after the one side of all cutting rings is worn, flipped over and can then work together with the other side. Of course, the grooves for the engagement of the upper knife must then also be located on the other side of the cutting rings. But since the intermediate rings are removed from the shaft and can easily be placed upside down, this is easy to do and can be done with a format change to be carried out anyway. In many cases it will not be avoided let at least some of the split intermediate rings be replaced and others with different ones Length is replaced when the cutting point is to resume its original position.

Claims (3)

Patent claims ao 1. Lower cutter shaft for cutting strips of paper, cardboard, plastic, fabric or the like, the intermediate rings that are used to guide the web and that serve as circular knives Steel ring washers is assembled together with the intermediate rings on the shaft are clamped, characterized in that several steel ring disks for each cutting point the shaft (1) are arranged, of which only those of a cutting groove (25 or 26 or 27) are adjacent Steel ring disks (13 to 15) serve as circular knives, while the others (22 to 24) after the used circular knives (13 to 15) have worn down and moved on the shaft (1) can be used one after the other as circular knives. 2. lower cutter shaft according to claim 1, characterized by such an arrangement of the Steel ring washers (13 to 15 or 22 to 24) and removable intermediate rings (10 to 12) on the Shaft (1) that a worn steel washer (13 or 14 or 15) after removing the adjacent one Intermediate ring (10 or 11 or 12) can be moved over its bearing on the shaft (1) is and thereby after the replacement of the intermediate ring on the other side of the same and thus ineffective, whereby the next steel ring washer (22 or 23 or 24) assumes the cutting position. 3. lower cutter shaft according to claim 1 and 2, characterized in that the removable intermediate rings (10 to 12), which are designed in two parts in a manner known per se, at one of them or are provided at both ends with a narrow shoulder of smaller diameter, the serves as a groove (25 or 26 or 27) for the engagement of the counter knife. 1 sheet of drawings ® 009 647/274 11.60