EP3838522A1 - Knife, slicing machine equipped with same and method for operating a slicing machine - Google Patents

Abstract

On the one hand, to prevent regrinding of the knife (3) of a slicing machine (1) from changing the behavior of the knife (3) during operation and, on the other hand, to achieve very gentle penetration and good disc removal, the radially outermost area of Knife (3) produced as a regrinding area (4 *) with a very small, in any case constant in the radial direction, thickness (D).

Description

I. Field of application

The invention relates to the cutting of an item to be cut into slices, especially slices of exact weight, which should be cut off as cleanly as possible.

II. Technical background

The production of such slices or portions from an elastic strand material is relatively problem-free if this strand material has the same cross-section throughout its length and consists of a homogeneous material that can be cut equally everywhere, such as an industrially produced sausage strand or cheese -Strand.

• entweder mittels eines runden rotierenden Messer, welches quer zum Strang vor- und zurückgefahren werden kann,
• oder mittels eines sichelförmigen Messers, dessen Rotationsachse im Betrieb still steht und bei dem sich die Schneidkante auf dem Außenumfang der Sichel befindet,
  jeweils eine Scheibe vom strangförmigen Schneidgut abschneiden, während der dabei meist frei liegende Strang kontinuierlich oder nur zwischen den Schneidvorgängen vorwärts gefahren wird.

So-called slicers are known for this

• either by means of a round rotating knife, which can be moved back and forth across the strand,
• or by means of a sickle-shaped knife whose axis of rotation stands still during operation and where the cutting edge is on the outer circumference of the sickle,
  cut one slice from the strand-shaped material to be cut, while the strand, which is mostly exposed, is moved forward continuously or only between the cutting processes.

An irregularly shaped cut product such as a grown piece of meat does not have these properties, however, because each of these irregular pieces of meat has a different shape and also a cross-section that changes over the length and can also consist of materials of different consistency, hardness and elasticity, for example from the Fat, the pure muscle meat and / or the surrounding silver skin.

For the purposes of the present invention, the product to be cut is referred to as a piece of meat, without restricting the invention to meat as the product to be cut, so that it can also be irregular and undefined shaped pieces made of a different material.

In this context, it is already known to first deform such a piece of meat so that it has a defined, known cross-section - in particular at least at the end at which the next slice is cut, if cutting is then carried out, at least at the point in time cutting off the disc - preferably over the entire length.

A relation can then be established between the adjustable thickness of the disk and the weight of the disk using its specific weight, which is generally known or can be estimated.

Regardless of this, the quality of the cut - for example a fray-free cutting edge of the slice, a constant slice thickness over its entire surface, etc. - the better, the less pressure in the direction of penetration the knife dips into the material to be cut, the less resistance there is The material to be cut is opposed to the knife and, in this context, the more the cut is a pulling cut, i.e. the greater the pulling factor is.

The pull factor is understood to mean the relation between the penetration speed perpendicular to the cutting edge at the penetration point and the circumferential speed of the knife along the knife edge, especially when the cutting edge comes into contact for the first time.

In addition to the quality of the cut, it is also very important that the severed pane is placed in the correct position and without folds.

III. Presentation of the invention a) Technical task

It is therefore the object of the invention to provide a knife and a slicing machine equipped therewith and an operating method for this, with which an optimal cutting result and correct placement of the severed slice is achieved as independently as possible of the consistency of the material to be cut and in particular the differences in consistency within the food to be sliced.

b) Solution of the task

This object is achieved by the features of claims 1, 12 and 13. Advantageous embodiments emerge from the subclaims.

A generic, rotatable or rotating knife is usually plate-shaped or slightly cup-shaped and has on its peripheral edge - usually viewed in the axial direction, i.e. on the main plane of the knife - a curved peripheral edge that is at least partially designed as a cutting edge , i.e. when viewed in the radial cross-section, tapers to the outside at an acute-angled cutting angle which is usually greater than 20 °.

To produce this cutting edge, the knife is generally only sharpened from one side, which is defined here as the rear. From the knife plane, which is defined by the cutting edge, this ground surface, which is part of the rear side, rises radially inwards at an acute cutting angle.

In the case of a rotatable knife according to the prior art, this ground surface is usually adjoined radially inward by a connection surface which is also at an acute angle to the knife plane, which, however, is less than the cutting angle.

According to the invention, on the other hand, on the rear of the knife, a regrinding area of the knife adjoins this ground surface radially inwards as a connection surface, over the entire radial extent of which the knife has the same thickness. This connection surface therefore runs parallel to the plane of the knife.

The regrinding area extends in the circumferential direction, preferably along the entire length of the cutting edge.

As a result, when regrinding the ground surface - provided this is done at the same cutting angle that the ground surface assumed from the beginning to the knife plane - the thickness of the knife in the area of the ground surface and the regrind area does not change, and thus also not the radial extent the ground surface, so that over the entire regrinding area and thus regardless of the state of wear, the knife always has the same parameters and relationships in terms of cutting angle, radial extent of the ground surface, thickness of the knife, in particular at the transition between the ground surface and the connecting surface adjoining it radially inward, owns.

The regrinding area is thus arranged radially between the grinding surface and a further connection surface, and in particular directly adjoins at least one of them, in particular both of them.

The same or constant thickness is understood to mean a thickness with deviations that are unavoidable in the context of the manufacturing process of the knife, in particular that the thickness in the regrinding area is less than 0.5 mm, better by less than 0.3 mm , better by less than 0.2 mm, better by less than 0.1 mm between the largest and smallest thickness of the knife in this regrinding area.

These permissible deviations are so small, in particular, because in the regrinding area the thickness of the knife should in any case only be a maximum of 2 mm, better only a maximum of 1.5 mm, better, only a maximum of 1.1 mm.

The radial extension of the regrinding area is a maximum of 20 mm, better only a maximum of 15 mm, better only a maximum of 11 mm.

With the specified thickness of the knife in the regrinding area, this is sufficient for almost all items to be cut in the food sector for sufficient stability of the knife in the regrinding area.

If the knife is a bowl-shaped, concave knife, the recess on the concave front side of the knife preferably only begins radially within the regrinding area, so that the front side of the knife in the regrinding area and up to the cutting edge is possibly a flat surface .

Especially with the specified dimensions in the regrinding area, the adhesive forces that occur between the material to be cut and knife or disk and knife are still so low that clean cutting, i.e. in particular without fringes on the cut edges of the disk, and clean storage are achieved can.

Since the correct placement of the disc depends on whether the disc is always thrown off the knife in the same way, there is of the Regrinding area, offset radially inwards, is a connection surface which in the radial direction preferably again runs at an angle to the knife plane and thus increasingly moves away from the knife plane in the radial inward direction and serves as a deflection shoulder, which the outer circumference arriving there of the severed disc is directed away from the knife plane in the axial direction and is intended to cause a defined ejection.

Accordingly, this deflector shoulder also extends in the circumferential direction over the entire length of the cutting edge.

The deflecting shoulder can bridge the distance in the axial direction between the creeping area and a further inner connection surface, which is further inward and axially further spaced from the knife plane, or can even protrude over the radially outer edge of this next connection surface in the axial direction and one Form deflection bead in order to ensure sufficient axial extension of the deflection shoulder.

The next connection surface can run parallel to the knife plane or be inclined in relation to this, that is to say run radially inward with increasing distance from the knife plane, or it can also have any other configuration.

Preferably, the deflector shoulder cut in the radial direction has a larger deflection angle to the knife plane than the ground surface, i.e. than the cutting angle, which is usually greater than 20 °, because the disc is primarily through this deflector shoulder in the axial direction should be deflected and less by the grinding surface.

Of the multiple connection surfaces spaced apart from one another in the radial direction at different distances from the knife plane - regardless of whether the connection surfaces are parallel or inclined to the knife plane - one can each be designed as a deflector shoulder, as described above.

The above-described design of the knife can be present both in the case of a sickle-shaped knife in which the outer circumferential contour of the knife, designed as a cutting edge, increases in the circumferential direction counter to the direction of rotation of the knife in its operation, and in the case of a knife with a circular ring-shaped circumferential, annularly closed or only extending over a segment cutting edge, so in particular a circular disk-shaped knife.

In particular, a circular disk-shaped knife can be plate-shaped, that is to say in particular with a flat front side, or shell-shaped, with a recess concave in the center in the front side of the knife.

A slicing machine known per se, in which the knife according to the invention can also be used, comprises a cutting unit which has such a knife as described above, the axis of rotation of the knife depending on the basic shape of the knife - sickle-shaped or circular disk-shaped cutting edge , i.e. the knife axis, stands still during operation or has to be moved for immersion in the material to be cut.

Furthermore, there is a product support on which the item to be cut, i.e. the product, is placed and fed to the cutting unit and is pushed forward along the product support during the slicing, the support surface for the item to be cut preferably obliquely downwards towards the cutting unit is arranged inclined to the horizontal.

With regard to the method for operating such a slicing machine and / or designing the cutting edge of the knife, the aim is to achieve the highest possible pull factor of the pulling cut, at least when the knife makes contact with the material to be cut at the contact point.

In the case of a sickle-shaped knife, this can be achieved by appropriately shaping the cutting edge in relation to the contact point between the sickle-shaped knife and the material to be cut, which is dependent on the shape of the product and the support position.

In the case of a knife with a circular ring-shaped circumferential, endless cutting edge, i.e. a circular disk-shaped knife, the knife axis is displaced during operation, usually displaced in an oscillating manner, the return stroke serving, viewed in the feed direction, that the knife is completely out of the path of movement to bring the food to be sliced forward.

However, the movement of the knife should be controlled in such a way that, for the immersion of the knife into the material to be cut, the cutting edge comes into contact with the material to be cut as soon as possible after the knife has reached the position furthest away from the product support.

Since the knife axis for the forward stroke has to be accelerated from standstill from this reversal point of the oscillating knife movement, the speed in the plunge direction, i.e. perpendicular to the cutting edge, is lower, the shorter the time span available for the acceleration in this plunge direction and so that the shorter the path from the reversal point of the knife axis to the contact of the material to be cut through the cutting edge.

The lower the immersion speed, the higher the pull factor, which should be at least 1 in 15.

In order to have enough time to push the material to be cut forwards to cut off the next slice, the oscillating movement of the knife axis can also be stopped at the reversal point, or the movement of the knife axis can be slowed down in the area of the reversal point.

Preferably, at the reversal point of the knife axis, the cutting edge should be no more than 50 mm, better no more than 30 mm, better no more than 20 mm from the circumference of the material to be cut in order to achieve the desired low penetration speed.

c) Embodiments

Figur 1a:

eine Aufschneide-Maschine geschnitten in Längs-Pressrichtung mit einem Sichelmesser,

Figur 1b:

eine Aufschneide-Maschine mit einem kreisscheibenförmigen Messer in gleicher Blickrichtung,

Figur 2a:

die Aufschneide-Maschine gemäß Figur 1a betrachtet in Längs-Pressrichtung vom Schneid-Ende des Formrohres aus,

Figur 2b:

die Aufschneide-Maschine gemäß Figur 1b betrachtet in Längs-Pressrichtung vom Aufschneide-Ende des Formrohres aus,

Figur 3:

einen Radialschnitt durch das Sichelmesser der Figuren 1a und 2a,

Figur 3a:

eine Detailvergrößerung hieraus,

Figuren 3b, c:

Detailvergrößerungen aus Figur 3a mit unterschiedlichem Übergang zwischen Nachschleifbereich und dem Rest des Messer-Querschnittes.

Embodiments according to the invention are described in more detail below by way of example. Show it:

Figure 1a:

a slicing machine cut in the longitudinal pressing direction with a sickle knife,

Figure 1b:

a slicing machine with a circular disc-shaped knife in the same direction of view,

Figure 2a:

the slicing machine according to Figure 1a viewed in the longitudinal pressing direction from the cutting end of the shaped tube,

Figure 2b:

the slicing machine according to Figure 1b viewed in the longitudinal pressing direction from the cutting end of the shaped tube,

Figure 3:

a radial section through the sickle knife of the Figures 1a and 2a ,

Figure 3a:

an enlarged detail from this,

Figures 3b, c:

Enlarged details Figure 3a with a different transition between the regrinding area and the rest of the knife cross-section.

The Figures 1a and 2a show slicing machines according to the prior art, the front views according to FIG Figures 2a , b the inventive design of the knife 3 is already shown, the cross section of which is based on the Figures 3 - 3c will be explained in more detail.

The slicing machines according to the Figures 1a , b , 2a , b have on the one hand - in addition to the base frame 13 of the machine - a cutting unit 2, which also includes the rotating knife 3, as well as an inclined downwards towards the knife 3 Directed product support 12 ', on which the product P to be sliced, in particular a grown piece of meat, rests and is pushed forward in cycles for cutting into slices S.

In this case, the product support 12 'is not a simple support surface, but a circumferentially closed shaped tube 12, which is open on both sides and in which the product P is not only pushed forward from a longitudinal one for cutting open -Press ram 14, but can also be pressed in the longitudinal direction beforehand by this longitudinal press ram 14 so that the product P has a uniform cross-section over its length by resting against the inner circumference of the molded tube cavity 15.

The stop plate 16 can serve as a stop in the longitudinal pressing direction 10 for pressing, which can be set to a certain thickness setting d in the form of a distance in the longitudinal pressing direction 10 to the front end, the cutting end 12a of the shaped tube 12, for cutting off the slices S is. The stop plate 16 can also be used as a longitudinal stop when pressing the product P by placing it directly on the front face of the molded tube 12, since the stop plate 16 has a size that corresponds to the cross section of the molded tube cavity 15 at the cutting end 12a can cover completely.

The stop plate 16 can either be attached to the base frame 13 and its axial position can be adjusted according to FIG Figure 1a or attached to the knife carrier 2a, as in FIG Figure 1b shown.

This depends on whether the knife 3 is a sickle knife 3 according to FIG Figure 1a , 2a or a circular disk-shaped knife according to Figure 1b , 2 B acts:
In the case of the sickle-shaped knife 3, the outer circumferential edge, designed as a cutting edge 3a, has an increasing distance in the course direction from the axis of rotation 3 '. This greatest distance is at the end of the cutting edge 3a between the cutting edge 3a and the axis of rotation 3 'so much larger than the smallest distance between the axis of rotation 3' and the part of the circumference that is not designed as a cutting edge 3a than the radial extension of the molded tube cavity 15 or the product P.

With a correspondingly close arrangement of the axis of rotation or knife axis 3 'on the molded tube cavity 15, this knife axis 3' does not have to be moved for the cutting off of slices S, in contrast to the Figures 1a , 2a , in which the circular disk-shaped knife 3 only comes out of the overlap with the molded tube cavity 15 by moving the entire knife 3 including the knife axis 3 'in an oscillating manner in the penetration direction 9 towards the molded tube 12 that the molded tube cavity 15 located completely within the flight circle as well as the real knife 3.

The latter is particularly important if, instead of a circular disk-shaped knife, it is a circular segment-shaped knife in which the cutting edge 3a, which is concentric to the knife axis 3 ', extends only over part of the circumference.

In the Figures 1a , b and 2a , b a slicing machine 1 with two parallel shaped tube cavities 15, here formed in a single shaped tube 12, is shown, the knife 3 each having a disc S during a separation process from both products P located in the two shaped tube cavities 15 cuts off, in which it has a correspondingly large diameter or flight circle.

Accordingly, in Figure 1a in the solution with a sickle-shaped knife 3, this is fastened with its knife axis 3 ', which in this case also runs in the longitudinal pressing direction 10, to a knife carrier 2a of the cutting unit 2, which is fixedly fastened to the base frame 13.

In contrast, the Figure 1b with a circular disc-shaped knife 3 or a circular segment-shaped knife 3 of the knife carrier 2a, in which the knife axis 3 'of the knife 3 is mounted, in a first transverse direction 11.1 to the longitudinal pressing direction 10 relative to the base frame 13 of the slicing machine 1 and displaceable in an oscillating manner drivable.

The stop plate 16 is also attached to the knife carrier 2a, since it should move in an oscillating manner together with the knife 3 in the first transverse direction 11.1, the penetration direction 9, which in this case runs perpendicular to the cutting edge tangent 8.

The inventive design of the knife 3 is in the Figures 3 - 3c better to see, which represent a section through the knife 3 in a radial plane to the knife axis 3 ':
Figure 3 shows a sickle-shaped knife 3 in a radial section which runs through the knife axis 3 '. The region near the cutting edge 3a that is relevant for the present invention is, however, the same in this sectional illustration in the case of a sickle-shaped knife and a circular disk-shaped or circular segment-shaped knife, as enlarged in FIG Figure 3a shown of what Figure 3b again shows an enlargement near the cutting edge 3a, to be precise during the severing of a disk S.

The simplest embodiment according to the invention, however, is in the sectional view of FIG Figure 3c visible:
The plate-shaped knife 3 has a cutting edge 3a in the form of a sharply ground outer peripheral edge, with the grinding taking place only from one side:
Therefore, the cutting edge 3a is formed by the knife front side 3.1, which is flat in the radially outermost area and thus also lies in the knife plane 3 ″, on the one hand and the inclined grinding surface 4 on the other, which runs along the The circumference extends and along the circumference preferably everywhere the same cutting angle α with respect to the knife plane 3 ″ and in the plan view, ie viewed in the direction of the knife axis 3 ', also the same width, as best in the Figures 2a , b to recognize.

The radially inner end of the ground surface 4, which is higher than the knife plane 3 ″, is adjoined by a connection surface 5, which extends radially further inward over a so-called regrinding area 4 *.

The essential thing, however, is that this first connection surface runs parallel to the front side 3.1 of the knife, i.e. the knife 3 has the same thickness D everywhere in the radial direction along the regrinding area 4 * both in the radial direction and in the circumferential direction within this regrinding area 4 *.

This has the advantage that when regrinding the knife 3 - the grinding means is always applied to the grinding surface 4 over its entire radial extent, and by removing material this ship surface 4 is moved further radially inwards in the direction of the knife axis 3 'with a constant cutting angle α - the knife 3 retains the same thickness D in its outermost area of the regrinding area 4 * over the entire duration of its use, because it is maximally regrinded up to the radially inner end of the regrinding area 4 *.

Because of the above-described small thickness D in the regrinding area, it is obvious that the radial extension of the regrinding area 4 * in relation to this must not be too large in order not to impair the stability of the knife in its radially outer area.

Radially from the connection surface 5 - which is an annular or partially annular surface - a further connection surface 5.1 is arranged, which in this case in turn runs parallel to knife plane 3 ″, ie mostly also the front side 3.1 of the knife, but maintains a greater axial distance from this than the connection surface 5, which is located in the regrinding area 4 *.

The axial height difference between them is overcome by a deflector shoulder 6 ″ which is at a deflection angle β to the knife plane 3 ″, progressively in the radial direction.

This deflection shoulder 6 ″ serves to ensure that the disc S separated from the cutting edge 3a - as better in FIG Figure 3b to recognize - is not only deflected by the grinding surface 4 alone from the knife plane 3 "and is deflected somewhat in the axial direction 10, but is supported here by the deflector shoulder 6", which at least with its upper edge also on the already separated Disk S rests and this further deflects in the axial direction 10, in the direction of the knife axis 3 '.

Because the more defined the guidance of the partially separated pane S away from the separation point, the more correct, i.e. in the correct position and without folds, the pane S is thrown onto the intended point of impact, which is usually located on a conveyor or in a collecting tray.

For this purpose, the deflector shoulder 6 ″ can also be made axially longer than the axial difference between the two adjoining connection surfaces 5 and 5.1 would allow, with the deflector angle β unchanged, in that the deflector surface 6 ″ even extends over in the axial direction the radially outer edge of the radially inner adjoining next connection surface 5.1 extends out and forms a deflecting bead 6, which runs parallel and concentrically to the cutting edge 3a along, as a rule, its entire extent.

How Figure 3a shows, can in this way adjoin the outermost connection surface 5, which defines the regrinding area 4 *, radially inwardly further connection surface 5.1, 5.2, 5.3.

The other connection surfaces from 5.1 can run parallel to the knife plane 3 ″ or be inclined to it, that is, radially inward towards the knife axis 3 ′ with increasing distance from the knife plane 3 ″.

Furthermore, the deflecting shoulder 6 ″ between the individual connection surfaces need not be designed as a deflecting bead.

Like especially those Figures 3b and 3c show, the deflection angle β is usually greater than the cutting angle α.

Also shows Figure 3a That the knife 3 can also have a concave recess 7 and on its front surface 3.1 so that a cup-shaped knife can be said as seen radially from outside to inside the recess 7 is preferably of the regrinding zone 4 * starting from the radially inner end thereof until further inward , in this case at the connection surface 5.2, in order not to allow the thickness of the knife 3 to drop below a predetermined knife thickness in any radial area

REFERENCE LIST

1

Slicing machine

2

Cutting unit

2a

Knife carrier

3

knife

3 '

Knife axis, axis of rotation

3 "

Knife plane

3.1

front

3.2

back

3a

Cutting edge

4th

Grinding surface

4 *

Regrinding area

5.1, 5.2

Connection surface

6th

Deflection bead

6 "

Rejection shoulder

7th

deepening

8th

Cutting edge tangent

9

Direction of penetration

10

Longitudinal pressing direction, axial direction

11.1, 11.2

Transverse direction

12th

Shaped tube

12a

Cutting

12 '

Product edition

13th

Base frame

14th

Longitudinal ram

15th

Molded tube cavity

16

Stop plate

α

Cutting angle

β

Deflection angle

d

Thickness, thickness adjustment (disc)

D.

Thickness (regrinding area)

P.

Product, item to be cut

S.

disc

Claims (14)

Rotatable, plate-shaped or bowl-shaped knife (3) with a front (3.1) and a back (3.2), suitable for use in a slicing machine (1), with - A curved peripheral edge which is designed as a cutting edge (3a) which defines a knife plane (3 "), wherein - On the rear of the knife (3.2), the cutting edge (3a) is adjoined by a radially inwardly extending, ground surface (4) inclined at an angle to the knife plane (3 "), which is at an acute cutting angle (a) to the knife plane ( 3 ") stands,
characterized in that
a regrinding area (4 *) of the knife adjoins the grinding surface (4) radially inwards on the knife rear side (3.2), the knife has the same thickness (D) over its entire radial extent.
(Rejection area :) Knife according to claim 1,
characterized in that - At least one connection surface (5) is present on the rear of the knife (3.2) from the regrinding area (4 *) radially further inward, which is axially further away from the knife plane (3 ") than the rear ( 3.2) in the regrinding area (4 *) and - At least the axial distance between them is bridged by a deflector shoulder (6 ") on the rear side (3.2), which runs at an angle to the knife plane (3"). Knife according to one of the preceding claims,
characterized in that - the regrinding area (4 *) is arranged radially between the grinding surface (4) and the deflector shoulder (6 "), - in particular directly adjoins at least one of them, in particular both of them in each case. Knife according to one of the preceding claims,
characterized in that
the deflector shoulder (6 ") protrudes transversely to the knife plane (3") further beyond this than the next connection surface (5) adjoining the deflector shoulder (6 ") radially on the inside. Knife according to one of the preceding claims,
characterized in that
the deflection shoulder (6 "), cut in the radial direction, assumes a larger deflection angle (β) to the knife plane (3") than the ground surface (4). Knife according to one of the preceding claims,
characterized in that - Several radially spaced connection surfaces (5, 5.1, 5.2, 5.3) are present and - In particular, the transition from one to the next connection surface (5, 5.1, 5.2, 5.3) is designed as a deflector shoulder (6 "). Knife according to one of the preceding claims,
characterized in that
the connection surface (5) runs parallel to the knife plane (3 ").
(Definition of same thickness :) Knife according to one of the preceding claims,
characterized in that
an equal thickness (D) means that the thickness (D) in the corresponding area by less than 0.5 mm, better by less than 0.3 mm, better by less than 0.2 mm, better than 0.1 mm between the largest and the smallest Thickness (D) differs in this area, calculated starting from the smallest thickness.
(Shape cutting edge :) Knife according to one of the preceding claims,
characterized in that
the cutting edge (3a) - A circular, encircling, closed cutting edge of an in particular circular disk-shaped knife (3), the convex outside being referred to as the rear side (3.2) of the knife (3) in the case of a bowl-shaped, circular disk-shaped knife (3)
or - Is a finite, circular disk-shaped or sickle-shaped cutting edge (3a). Knife according to one of the preceding claims,
characterized in that
In the case of a knife (3) with a finite, curved cutting edge and a knife axis (3 ') which is stationary during operation, the shape of the cutting edge (3a) is designed so that when the knife (3) dips into the material to be cut (P), the cutting edge also carries the product a pull factor of at least 1:15.
(Dimensions in the regrinding area) Knife according to one of the preceding claims,
characterized in that - the thickness (D) of the knife (3) in the regrinding area (4 *) is a maximum of 2 mm, better a maximum of 1.5 mm, better a maximum of 1.1 mm, - the radial extension of the regrinding area (4 *) is a maximum of 20 mm, better a maximum of 15 mm, better a maximum of 11 mm. Slicing machine (1) with - a cutting unit (2) with a rotatable knife (3), - A product support (12 ') for placing a product (P), characterized in that
the knife (3) is designed according to one of the preceding claims. Method for operating a slicing machine (1), in particular according to Claim 12,
characterized in that
In the case of a knife (3) with a circular, circular, closed cutting edge (3a), an oscillating movement of the knife axis (3 ') relative to the product support (12) is controlled in such a way that the knife (3) is immersed in the material to be cut (P ) the contact of the cutting edge (3a) with the material to be cut (P) takes place as soon as possible after the reversal of movement of the knife axis (3 ') at its point furthest from the product support (12'). Method according to claim 13,
characterized in that
the oscillating movement of the knife axis (3 ') relative to the product support (12) is controlled in such a way that the cutting edge (3a) contacts the material to be cut (P) with a tensile factor of at least 1:15.

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