DE1117374B - Circular knife for longitudinal cutting of web-shaped material such as paper or the like. - Google Patents

Description

GERMAN

PATENT OFFICE

M43862VHb / 55e

REGISTRATION DATE: DECEMBER 30, 1959

NOTICE LOGIN ANDOUTPUTE EDITORIAL: NOVEMBER 16, 1961

The upper knives used today for longitudinal cutting devices for material webs are designed in such a way that that the plate-shaped circular knife is arranged on a rotating hub-shaped support body and is subjected to a spring force which presses the circular knife against the associated lower knife. at In some designs of this type, the circular knife can only be moved in the axial direction and cannot move Set at an angle to the lower knife. However, such an inclination is necessary for the execution of a flawless and smooth longitudinal cut is necessary. Therefore, such statements are only in special cases usable.

Circular knives that adjust diagonally to the lower knife with the help of a spring have been around for a long time known. In the most widespread constructions of this type, the spring is in the form of a so-called ^ ' called spring cord arranged between the circular knife and its circumferential support body and therefore also circulates. This has the disadvantage that it is subjected to centrifugal force as a result Spring cord can lengthen and thus become ineffective. Add to that with the today often very high speeds there is a risk that the spring cord will tear and be thrown outwards.

It is also known a circular knife that wobbles on its revolving support body execute and can therefore adjust obliquely, in which, however, the spring cord by a plurality is replaced by coil springs. This construction also has the disadvantage that the springs revolve and are dynamically stressed. This causes the springs to show signs of fatigue, especially since the load changes follow one another extremely quickly and one in a short time extraordinarily high number of load cycles is achieved.

All mentioned disadvantages of the previously known designs of the storage and cushioning of Circular knives are eliminated by the invention by creating the possibility that the spring does not participate in the rotation of the circular knife. That will work out when the knife is stored on one a circumferential and a non-circumferential part existing support body achieved in that the non-rotating part both axially and obliquely to the fixed axis supporting it od. Like. under the action of a between the non-rotating part of the support body and the fixed axis Od. The like. Arranged spring is adjustable. A resilient member of any type can be used as the spring be e.g. B. a rubber ring between the axle or some other fixed part and the moving

Circular knife for longitudinal cutting

of sheet material,

like paper or the like

Applicant:

Maschinenfabrik Goebel GmbH,
Darmstadt, Goebelstr. 21

Helmut Antel, Darmstadt,
has been named as the inventor

borrowed, but not circumferential part of the support body is arranged. You can also use a spring cord to arrange them in the same way is and is supported in a known manner on one side of a conical surface. But there in general the forces of a spring cord are low and the point of application of the spring on the support body in accordance with circular knives designed according to the invention are in most cases unfavorable to the cutting point, it is especially appropriate for cutting thicker material, a spring 'with a higher spring rate to use. A helical spring or a coil spring surrounding the axis comes as such, for example Disc spring into consideration, the inner edge of which is on a shoulder or in a groove of the fixed axis and the outer wall of which is supported against the non-circumferential part of the support body.

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

The circular knife 1 is firmly clamped between the cover plate 2 and the ring 3 of the circumferential support body part. The ring 3 runs on a roller bearing 4, the inner ring of which sits on the non-rotating support body part 5. This has a support ring 6 in its bore, with which it is supported on the fixed axis 7. There is very little play between the two, which allows the ring 6 and thus the support body to carry out small movements on the axis, preferably in the axial direction, and also to adjust themselves at an angle. Outwardly these become

109 739/211

Movements through the collar 8 of the axis 7, which can also be formed by screwing on a washer, limited, in which the ring 6 lies against this covenant.

The force that presses the support ring 6 of the ring 5 against the collar or the disc 8 is through the Spring 9 caused in the exemplary embodiment is designed as a disc spring. It is supported with its inner edge on paragraph 10 of the fixed Axis 7 and acts in the axial direction by pushing its outer edge against the edge surface of the Ring 5 presses. Since the circumferential part 2, 3 of the support body and the circular knife 1 are in axial Direction cannot move relative to the ring 5, the force of the spring 9 also acts on the Circular knife as soon as this is employed in a known manner on the counter knife. The Support ring 6 at its part of its circumference facing the cutting point of the collar or the Disc 8 from; the ring 5 and thus the entire circular knife is positioned slightly at an angle to the axis 7. These However, inclination always remains with respect to the fixed axis 7 even during the knife run same. It follows that the spring 9 is only loaded statically and not dynamically and that the circumferential Parts only perform pure rotational movements, while with the previously known upper knives the spring is dynamically loaded depending on the circulation and the circular knife on its support body performs tumbling movements.

Claims (3)

PATENT CLAIMS: 1. circular blade for longitudinal cutting of sheet material such as paper or the. Like., Permitting a both axial movement and oblique positions of the knife, the action of one or more springs underlying position rank and a group consisting of an orbiting and a non-rotating part of the supporting body, characterized in that that the non-rotating part (5) both axially and od obliquely to the carrying it fixed axis (7). like. under the action of between the non-rotating part (5) of the supporting body and the fixed axis (7) od. Like. Arranged spring (9) is adjustable. 2. Circular knife according to spoke 1, characterized in that the spring has a disc spring (9) is, the inner edge of which is on a shoulder (10) or in a groove of the fixed axis (7) and their The outer edge is supported against the non-circumferential part (5) of the support body. 3. Circle diameter according to spoke 1 or 2, characterized in that the fixed axis (7) is provided with a further collar (8), which is used to limit the spring force Support body movement is used. Considered publications:
German Patent No. 674,560;
U.S. Patent No. 2187 211. For this purpose, 1 sheet of drawings ι 109 739/211 11.61