EP2650090B1 - Knife with a deflector element - Google Patents

Description

The invention relates to a drivable cutting blade for machines for slicing food products, especially cheese and fresh meat, wherein the cutting area of the knife, at the side facing the cut disc side of the knife is associated with a rejection element for a food slice.

From the DE 637 833 a generic knife for a machine for slicing food products is known. The knife is assigned as Abweiselement a Abdrückplatte slidably or easily detachable. The Abdrückplatte can be designed as a semi-circular in cross-section element which is mounted so pivotable in an equally semicircular groove that it either runs at the same height in the cutting edge or protrudes.

In another embodiment, the pressure plate is formed as a rectangular cross-sectional element which is arranged on the knife away from the cutting edge displaced or easily detachable. Both embodiments are intended to prevent sticking of cheese products on the knife.

This prior art solution may be acceptable for hand-operated slitting machines, but not for high-performance slicers. The risk of injury to the clippings when hitting the tear-off element is too great. In addition, at higher speeds it is to be expected that the deflection elements will be adjusted during the rotation.

The DE 10 2009 006 912 shows a circular cutting blade, which is provided in the cutting area with spherical protrusions. These serve to reduce the friction between the surface of the knife and the product slices during slicing, thereby reducing the acceleration caused by rotating the knives. This should be an exact filing.

Another cutting knife is from the DE 10 2007 040 350 known, which is designed as sickle knife. It is used for slicing food products, especially cheese. For the quality of the cutting process, the so-called cutting angle α must be taken into account. It is located on the radially outer circumference of the cutting blade. For closer Definition thereof is expressly referred to the disclosure of DE 10 2007 040 350 ,

If the cutting angle .alpha. Is large, then too great a pressure may be exerted on the product or the food disc and this may be compressed.

If it is too small, the food disc may be distracted insufficiently during the cutting process, d. h., the desired filing behavior does not occur.

The invention is therefore based on the object, in particular at Hochleistungsslicern to provide a cutting blade of the type mentioned above, which causes a targeted deposition of the cuttings while optimizing the aerodynamics of the cutting blade, especially at high cutting speeds.

This object is achieved according to claim 1.

In the invention, the deflector forms an integral part of the knife. The latter can be designed both as a circle or as a sickle knife. The deflector substantially follows the geometry of the cutting edge and is applied to the outside of the knife, i. h., It is located on the side of the knife associated with the cut food disc.

The deflector has, inter alia, the function of an air guide in the sense of a spoiler. Since the knife usually rotates at a high rotational speed, sets on the radially inner side of the formation in the boundary region to the blade surface, a radial air flows on the radially outer side results in the gap between the blade and the disc to be separated, an air cushion together in the vicinity of the molding for a soft, substantially contact-free deflection of the cut material care.

This effect is particularly caused by high rotational speeds, which are given in Hochleistungsslicern. Such indirect deflection is beneficial because the risk of injury to the cut material is prevented or reduced by the deflector.

Furthermore, the cutting blade, or the deflector is less dirty by the cutting process.

In this context, it is favorable if the cutting angle α of the knife is not too large. As already mentioned, a relatively acute cutting angle α causes a low compressive force when cutting the product. This has the advantage, especially with soft products such as fresh meat, cheese or liver cheeses, that the product deforms little and also adheres to the knife because of the smaller contact surface. Contributes to the above-mentioned air cushion, which forms due to the aerodynamics before shaping in the gap of the material to be cut and gently deflects the disc to be separated to the filing side.

According to the invention, the molding has a triangular cross-section. Such increases the stability of the knife and ensures a beneficial deflection during the cutting process.

It is possible to flatten the shape at the top of the triangle shape slightly to avoid physical contact with the disc to be separated and straighten the air flow low on the back of the disc to be separated. Furthermore, it is conceivable to arrange two or more deflector elements equidistant to the cutting edge. These deflectors can be used together for the design of the deflection flow. It is also possible to change the distance between the deflector elements over the circumference. The deflector elements can also be made spherical in cross-section, or vary in height in the circumferential direction. In particular, it is conceivable that they increase in height in the circumferential direction.

It is also possible that the facing away from the cutting edge deflectors are made higher.

Figur 1

eine Draufsicht auf ein erfindungsgemäßes Sichelmesser,

Figur 2

einen Vertikalschnitt durch das Messer von Figur 1 gemäß der Linie II-II,

Figur 3

eine Draufsicht auf ein nicht-erfindungsgemäßes Beispiel eines Sichelmessers, das in einem Distanzbereich mit geprägten Ausformungen versehen ist, und

Figur 4

einen Vertikalschnitt durch das Sichelmesser von Figur 3 gemäß Linie IV-IV.

In the following the invention will be described with reference to a drawing. Show it:

FIG. 1

a top view of a sickle blade according to the invention,

FIG. 2

a vertical section through the knife of FIG. 1 according to the line II-II,

FIG. 3

a plan view of a non-inventive example of a sickle blade, which is provided in a distance range with embossed formations, and

FIG. 4

a vertical section through the sickle blade of FIG. 3 according to line IV-IV.

This in FIG. 1 shown cutting blades 10 is provided for not shown machines for slicing food products, especially fresh meat or cheese. It can be used especially for high performance slicers. It has a mounting portion 11, with which the cutting blade can be attached to one side of a drive shaft, not shown. Radially outward adjoins a distance range 12, which is finally supplemented by a cutting area 13 outside.

The pictured sickle blade otherwise corresponds to that of the DE 10 2007 040 350 dating back to the same applicant. The disclosure of this document is expressly incorporated by reference.

The cutting blade 10 has a cutting edge 14, which deviates from the circular shape, and which rotates in the form of a spiral. The cutting edge 14 begins at a recess 15 and ends at a radial end edge 16. The cutting edge has a cutting angle α, which is responsible for the own cut. In the present case, he is chosen relatively small.

The FIG. 1 shows the knife 10 with its outside, ie, with the surface associated with a separated food disc. On this side, the knife has at least one deflector 17. The latter is formed by an outwardly applied molding formed integrally with the cutting blade, as for example FIG. 2 shows. The deflector 17 can follow the cutting edge 14 at a constant distance a, as shown by way of example in FIG FIGS. 1 and 2 is shown.

FIG. 2 is removable that in the present case, the deflector 17 is designed triangular in cross section and forms a bump with approximately equal sides flanks. In the present case, an angle of approximately 100 ° results between these flanks.

The front flank occupies a flank angle β of approximately 45 ° to the underside of the blade. Both the cutting angle α and the flank angle β influence during the rotation of the cutting blade during the cutting process, the aerodynamics between the knife and Schneidgut, or the separated slice.

On the one hand results in the boundary region between the knife and air due to the high rotational speed of the blade, a radial flow r, which is directed from the knife center to the outside and is bent at the back of the Abweiselementes 17 upwards.

On the other hand, during cutting, due to the penetration of the knife into the material to be cut between the cutting edge 14 and the outer flank of the Abweiselements 17 an air cushion 19, which together with the radial air flow r to a soft and gentle bending and deflecting of the slice to be separated from the knife. The deflector works in this case as an air guide in the sense of a spoiler, which is flown on the inner edge of the radial air flow r and on the outer edge of the air cushion 19.

The deflector 17 can be varied in height in the circumferential direction. Towards the end edge 16, it may increase in height.

The cutting blade 10 may also be formed as a circular blade, wherein the above explanations are to be applied analogously.

FIG. 3 shows an example of a trained as a sickle knife cutting knife and in turn the outside thereof. To avoid repetition, corresponding parts are provided with the same reference numerals. Only the differences are discussed.

In the distance range 12, this example has embossed, mutually recessed and raised formations 20, which serve to stiffen the cutting blade. They may be circular, or elongated, especially in the radial direction oriented wells. They may extend one behind the other in the radial direction, be wider at their radially outer end than at their radially inner end. Furthermore, the formations can become deeper in the radial direction.

Above all, radially directed formations, together with the deflector elements 17 and 18, can produce a radial air flow during the cutting process, which makes it possible to deflect the cut material from the knife without damaging it at high cutting speeds.

Parallel to the outer deflector 17 is still radially inwardly offset another deflector 18, which is designed slightly wider than the deflector 17, as in FIG. 4 is shown.

Both deflecting elements 17 and 18 are crowned, the element 18 is higher than the element 17. In the present case, both equidistant to the cutting edge 14, wherein it is also conceivable to change the distance to the cutting edge over the circumference, for example, to increase.

The cutting blades 10 may be provided with a small cutting angle α in order to keep the cutting pressure low. The deflectors 17, 18 still provide with the help of an air cushion 19 between the blade and disc for sufficient storage of the material to be cut. This is particularly advantageous for sticky products such as cheese, but also for fresh meat.

Claims (6)

1. A rotatably drivable cutting knife (10) for machines for slicing food products, in particular fresh meat or cheese, especially for used in high-speed slicers, the blade area of the knife having associated therewith a deflector (17) for a slice of food on the knife side facing the cut-off slice, wherein at least one deflector (17) defines a shaped piece formed towards the outside and following the cutting edge (14) of the cutting knife (10), which is configured as a circular knife or a sickle knife,
   characterized in that
   the deflector (17) is triangular in cross-section, wherein the shaped piece may be flattened at the apex of the triangular shape, and
   that the radially inner flank of the deflector (17) has a smaller angle of inclination than the radially outer flank thereof.
2. A cutting knife according to claim 1, characterized in that the shaped piece (20) is flattened at the apex of the triangular shape.
3. A cutting knife according to at least one of the preceding claims, characterized in that the deflectors (17, 18) have flanks with different angles of inclination, in particular the radially inner flanks having a smaller angle of inclination than the radially outer ones.
4. A cutting knife according to at least one of the preceding claims, characterized in that the deflectors (17, 18) may be variable in height.
5. A cutting knife according to at least one of the preceding claims, characterized in that the deflectors (17, 18) increase in height in the circumferential direction.
6. A cutting knife according to at least one of the preceding claims, characterized in that the cutting knife has a comparatively small cutting edge angle (α).

Images