DE1108552B - Plate-shaped circular knife for cutting strips of paper, cardboard, plastic, fabric or the like. - Google Patents

Description

INTERNAT. KL. D 21 g

GERMAN

PATENT OFFICE

M28799Vn / 55e

REGISTRATION DATE: NOVEMBER 15, 1955

NOTICE THE REGISTRATION ANDOUTPUTE EDITORIAL:

June 8, 1961

The main patent 1018 300 relates to a plate-shaped circular knife for cutting webs Made of paper, cardboard, plastic, fabric or the like, consisting of one by embossing, pressing or one Similar machining process deformed and then hardened sheet metal disc, in which the outer The edge of the disc is offset from the inner part and only the one outside the offset hardened narrow ring-shaped edge part, the middle part lying within it, however, unhardened is.

The subject of the present invention is a further, particularly expedient design a circular knife according to the main patent. It consists in the inner and outer ring surface lie on a common conical surface that is only at a very small angle from the radial plane deviates, and that an annular bead is arranged between the two surfaces. This bead enables the outlet of the grinding tool that only works on the edge surface.

An embodiment of a circular knife according to the invention is shown schematically in the drawing shown in cross section.

The inner ring part of the knife is designated with a, the outer ring part with b . Between the two is the likewise ring-shaped bead, which was created by pressing or a similar processing of the originally flat or conical disc. The front surface d of the outer ring b and the front surface e of the inner ring α lie on a common conical surface, which is indicated in the drawing by a dot-dash line.

The circular knife is ground only on the edge surface, namely generally on the outer circumferential surface / and on the end face d. However, this type of grinding is mainly only intended for new circular knives, while the end face d is preferred for regrinding, without a grinding process taking place on the face /. The grinding process on the surface d can be carried out in such a way that the surface e is not touched by the tool, rather that it only extends as far as the hollow of the bead c . As a result, it is not only possible to get by with a small grinding surface, but the re-sharpened knife also has a good appearance because there is nowhere to be seen a transition from the sharpening surface to an unsanded surface.

Plate-shaped circular knife

for cutting strips of paper,

Cardboard, plastic, fabric or the like.

Addendum to patent 1,018,300

Applicant:

Machine factory GOEBEL GmbH,
Darmstadt, Goebelstr. 21

Dr. Dr.-Ing. e.h. Wilhelm F. H. Köhler, Darmstadt, has been named as the inventor

All the advantages that are given for the circular knife, to which the main patent relates, also apply to the present embodiment. In particular, it is possible to harden the outer ring & inductively without influencing the inner ring α. The bead-shaped design of the intermediate ring prevents stresses from being transferred from the ring part b to the ring part α due to the hardening, since the bead c absorbs them. To relieve any stresses that still occur, however, radial slots open towards the inside can be made in the inner ring α.

Claims (1)

PATENT CLAIM: Plate-shaped circular knife for cutting webs of paper, cardboard, plastic, fabric or the like, consisting of a sheet metal disc deformed by embossing, pressing or a similar processing step and then hardened only in the annular edge part according to patent 1018 300, characterized in that the inner and the outer annular surface of the circular knife (α or b) lie on a common conical surface which deviates from the radial plane only by a very small angle, and that an annular bead (c) is arranged between the two surfaces (a and b). 1 sheet of drawings