DE9000617U1 - Circular cutting blade, particularly for a longitudinal cutting and/or creasing machine for corrugated cardboard - Google Patents

Description

Patent attorneys .**. ·. \ I ". I '. '· S DIpl.-lng.E.Eder · &idigr; . &iacgr; i ·

DIpll Dipl.. Ing. MB HMH

KSchteschke 0 EnMMM

BHS-Bavarian Mining, Metallurgy and Salt Works AG 8000 Munich 2

Circular cutting blade, in particular for a circular cutting and/or creasing machine for corrugated cardboard

The innovation relates to a circular cutting blade, in particular for a longitudinal cutting and/or creasing machine for WsILpspp« with the Mertealeri -'^s upper part of the protection claim 1.

In the case of circular-shaped cutting knives used in practice for a longitudinal cutting and/or ripping machine, the outer surface runs parallel to the axis of rotation at a very acute angle to the cutting edge. The inner surface merges into the cutting surface at an angle of 90°. This well-known shape of a cutting knife is shown in broken lines in Fig. 2. The disadvantage of the well-known shape of a circular cutting knife is that the cutting quality does not meet all requirements, particularly with multi-wall corrugated cardboard.

The innovation is based on the task of creating a cutting blade in ( } circular shape that enables kink-, crush- and tear-free longitudinal cutting even in multi-wall corrugated cardboard without rolling up the edges when the adhesive joints are not yet fully cured, and ensures clean cutting edges.

The innovation solves this problem with the characteristic features of claim 1.

By choosing a slimmer transition from the outer surface and inner surface to the cutting surface, a perfect, kink- and crush-free longitudinal cut is achieved even with double/double and tri-wave qualities of corrugated cardboard.

There is no curling of the edges, even if the glued joints of the corrugated cardboard are not yet fully cured. This results in clean cutting edges, which are particularly important for insertion into further processing machines.

Further details of the innovation are provided in the

The innovation is explained in more detail below using an example shown in the drawing. The drawing shows:

Fig. 1 a view of the cutting blade in circular form after the innovation;

Fig. 2 a partial vertical section.

The cutting blade 1 is circular in shape. It has a mounting hole 2 in the middle for a drive shaft (not shown).

The cutting blade 1 has a flat cutting surface 3. This ring-shaped cutting surface lies in the plane X-X.

Preferably, the diameter of the cutting blade 1 is 200 rom. The cutting surface 3 then has a width ϳ ν ^° π of 1.5 mm to 2.5 rom.

From the cutting edge 4, the outer surface 5 extends towards the rotation axis Y at an angle eC to a parallel to the rotation axis Y of 4<&idigr; to 45*.

After a certain ring area, the outer surface 5 changes to an angle £ to a line parallel to the rotation axis Y of approximately 55*.

After another ring area, the outer surface 5 changes into an angle of 55' to 70".

Instead of such a polygonal line, the outer surface 5 can also have a continuous transition.

The known shape of the outer surface 5' is shown in dashed lines.

The inner surface 6 is set back from the plane XX of the cutting surface 3 by an amount CaJ of approximately 0.5 mm. It merges into the cutting surface 3 at an angle β of approximately 15 to 35* from the plane XX of the cutting surface.

The known shape of the inner surface 6' is shown in dashed lines.

In the ring areas 7, 8 marked by thick lines, the outer surface 5 and/or inner surface 6 can have the lowest possible roughness. For this purpose, the cutting blade 1 is preferably polished in these ring areas 7, 8.

The cutting blade 1 shown is an upper blade according to Fig. 2. This works together with a lower blade of the same design (not shown). The upper and lower blades are offset in height from each other and touch each other in an overlapping manner in the area of their cutting surfaces.

Patent attorneys

DIpI.-Ing. EÖEder

Dipl.-Ing. K. Skhleschke

eooo Rent 40 riraisabetfistr. 34

Claims (7)

Patent attorneys DIpI.-Ing. E. Eder
Dlpl.-Inq. (C Schlaschke MW Münctien 40 - Ellsabethsti, 34 BHS-Bavarian Mining, Metallurgy and Salt Works AG 8000 Munich 2 Circular cutting blade, particularly for a longitudinal cutting and/or creasing machine for corrugated cardboard Protection claims 1. Cutting blade in circular shape, in particular for a longitudinal cutting and/or creasing machine for corrugated cardboard, with a flat cutting surface running perpendicular to the axis of rotation, an outer surface running at an acute angle to a perpendicular to the cutting surface, an inner surface which is set back from the plane of the cutting surface and merges into the cutting surface at an angle, characterized in that that the angle Λ between the outer surface (5) and the perpendicular to the cutting surface (3) is 40 to 55°. 2. Cutting knife according to claim 1, characterized in that the transition angle β between the inner surface (6) and the plane of the cutting surface (3) is an acute angle. 3. Cutting knife according to claim 2, characterized in that the transition angle β between the inner surface (6) and the cutting surface (3) is approximately 15° to 35° 4. Cutting knife according to claim 2, characterized in that the inner surface (6) is set back by approximately 0.5 mm relative to the plane of the cutting surface (X-X). .1 · · 5. Cutting knife according to claim 1, characterized in that the outer surface (5) extends continuously or with multiple breaks from the cutting edge (4). 6. Cutting knife according to claim 1, characterized in that the ring width σ of the cutting surface is approximately 1.5 to 2.5 mm. 7. Cutting knife according to claim 1, characterized in that the outer surface (5) and/or the inner surface (6) adjacent to the cutting surface (3) is polished at least in an annular region.