Cutting – Tool or tool with support – Rotatable type
Patent
1991-05-29
1992-11-03
Yost, Frank T.
Cutting
Tool or tool with support
Rotatable type
83346, 83698, B26D 726
Patent
active
051598680
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a cutting or knife cylinder for processing weblike material, such as paper, plastic sheets or metal foils, fabric or the like, having at least one slot formed in the cutting cylinder and lying parallel to the rotational axis of the cutting cylinder on its circumference and provided to receive and attach a knife arranged substantially parallel to the rotational axis of the cutting cylinder; pressure points are distributed over the length of each knife to clamp the respective knife with respect to the cutting cylinder by means of several pressure medium cylinders, pressing the respective knife against the cutting cylinder and distributed over the length of each knife, pressure conduit system is connected to the pressure medium cylinders and revolves with the cutting cylinder, for each knife at least one shim is arranged between that knife and associated pressure medium cylinder. The pressure medium cylinders assigned to each slot are arranged both within the slot and also substantially in the circumferential direction of the cutting cylinder, and the pressure medium cylinders are bellows cylinders made preferably of metal.
Cutting cylinders of the aforementioned type are used in machines to produce cuts in weblike materials. These cuts can be produced with knives which do not have a continuous cutting edge so that in the manner a perforation is generated. However, the knives can also have a continuous cutting edge. Thus, it is possible to cut off sheets of specific length from a continuous web or to deposit this web into accordion-like folded stacks. The cutting or cut lines formed in the webs are usually aligned at right angles to the grain direction of the web to be processed. The knives required for this purpose are usually inserted into a revolving cutting or knife cylinder in such a manner that knives that have become dull can be exchanged without the entire cylinder having to be removed from the respective processing machine, for example a form printing machine. At least one knife is attached to each cutting cylinder. However, to form cross perforations, which are to exhibit a shorter distance between one another than corresponds to the diameter or circumference of the cutting cylinder, several knives, for example, two, three, six or eight knives are distributed regularly or irregularly on the circumference of the cutting cylinder.
So that the knives can be effective in the desired manner, they must be adjusted relative to the web to be processed or to pressure cylinder interacting with the cutting cylinder. For this purpose, the knives are usually attached force-lockingly to the cutting cylinders or within the cutting cylinder. If the knives have become blunt in the course of their use, they have to be exchanged for new knives. However, an exchange of knives usually requires as a rule that both the cutter, in which the respective knife is installed, and another machine that eventually works together with the cutter, for example, a form printing machine, must be stopped. Stopping the machine automatically causes loss in production, which is as high as corresponds to the time in which the machines must be stopped. Therefore, one endeavors to perform the exchange of the knives, consuming as little time as possible.
A device of the aforementioned type is known, for example, from U.S. Pat. No. 4,671,154, for which reason reference is made herein to this patent in order to support the description of the present patent application. The device described here can, however, be further simplified in its construction, from which it follows as the object of the present invention to improve the construction known from prior art in such a manner that its operation is even further simplified.
SUMMARY OF THE INVENTION
The aforementioned problem is solved by a device formed in the cutting cylinder to limit the extent of each of the pressure medium cylinders, this limiting device being arranged within the respective slot and between the respective pressure medium cylinders and the respective
REFERENCES:
patent: 3769868 (1973-11-01), Hornung
patent: 4131047 (1978-12-01), Schriber et al.
patent: 4594928 (1986-06-01), Thomas et al.
patent: 4671154 (1987-06-01), Thomas et al.
patent: 4715250 (1987-12-01), Rosemann
Herd Josef
Thomas Hermann
Jones Eugenia A.
Maschinenfabrik Goebel GmbH
Yost Frank T.
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