DE102012107520A1 - Rotatably driven knife set for food processor, has specific pair of blades that are driven around rotation axis, and pivoted in stable position partially over another pair of blades in direction of rotation axis of knife set - Google Patents

Abstract

The knife set has pairs of blades (18-21) that are oppositely located in direction of rotation axis (x) of the knife set. The blades (20,21) driven around the rotation axis are pivoted in stable position partially over the blades (18,19) in the direction of rotation axis. The blades are arranged one above the other in same direction of rotation. The knife set is brought into stable superposition in the direction of rotation axis.

Description

The invention relates firstly to a rotary driven knife set for a food processor, in particular an electric motor driven food processor, with four knives rotating about a rotation axis.

Knife sets of the type in question are known. These find particular use in food processors, more preferably electric motor driven kitchen appliances for household use. In this regard, for example, on the EP 1639928 B1 directed. The content of this patent is hereby incorporated in full into the disclosure of the present invention, also for the purpose of including features of this patent in claims of the present invention.

From the aforementioned patent a knife set is known, which has four with respect to a preferred in the operating position of the blade set vertically aligned axis of rotation about this axis of rotation drivable knife. In a projection into a transverse plane relative to the axis of rotation, the four knives enclose substantially an angle of 80 to 100 degrees, more preferably about 90 degrees, between two knives following each other in the direction of rotation. The knife set can be arranged in a mixing vessel of the food processor, so on, in particular in the bottom region of the mixing vessel, wherein more preferably the drive of the knife set via a coupling by an electric motor provided in the kitchen machine. The blades of the blade set further preferably extend in different, superimposed in the direction of the axis of rotation planes. It is further known in this respect to arrange two with respect to the axis of rotation substantially diametrically opposed knife in a relation to the axis of rotation lower and the two other, more preferably also substantially diametrically opposite knife in a relation to the axis of rotation upper level.

In view of the known state of the art, a technical problem of the invention is seen in the improvement of a set of knives of the type in question in use-advantageous manner on.

A possible solution of the problem is given according to a first inventive idea in a set of knives, which is geared to that two of the knives are pivotable about the axis of rotation of the knife set in a position in which this at least partially in the direction of the axis of rotation in a stable superposition the other two knives are. According to this embodiment, a set of blades is specified, which is characterized by a use advantageous embodiment. For this purpose, the two knives are pivotably arranged relative to the other two knives of the set of knives about the axis of rotation of the knife set, so that they can be brought from the preferred, with respect to a floor plan, crosswise arrangement in a superimposition to the fixed relative to this two knives. In this case, the two pivotable knives dive in a preferred embodiment under the purpose relatively fixed knife or cover it. Also, in this regard, there is the possibility that one of the two pivoting knives dives under a relatively fixed knife and the other pivotable knife covers the other relatively fixed knife. According to this, accordingly, a generally elongated knife arrangement, preferably substantially with flexion on the axis of rotation, can be obtained and thus more easily removed in the mixing vessel or the like previously processed by the knife set, in particular in the vicinity of the bottom of the mixing vessel are.

This also makes it possible to conveniently fill the mixing vessel or the like provided with the set of knives, since the overlapping area given by the knives to the mixing-vessel bottom is substantially reduced. This overlapping surface is reduced by pivoting the one two knives in a superposition to the other two knives to preferably 20 to 50 percent over the overlap area with non-pivoted knives.

Further preferred are both pivot positions of the two knives, d. H. the pivoting position of the two knives for forming a substantially crosswise arrangement of all the knives to each other and the pivoting position of the two in the superposition of the other knives stable, further in particular during operation of the knife set, d. H. stable on rotation. This is achieved in one embodiment, according to locking the two pivoting knives in one or the other pivotal position. Such a lock can be brought about by the user. In an alternative and further preferred embodiment, the respective stable position is achieved by a stop limit of the two blades in the direction of rotation of the blade set or contrary to the usual direction of rotation of the same. For this purpose, it is further preferred that the two fixed relative to the pivoting knives knives are rotatably connected to the drive shaft of the knife set, while the other two knives are preferably arranged relative to the drive shaft about this pivotable, but limited stop.

When arranging such a knife set in an electric motor driven food processor is more preferably the knife set in both the one and in the other direction of rotation about the axis driven, this example, according to appropriate switching of the driving electric motor. This direction of rotation reversal of the knife-set drive can be used in an advantageous manner for pivoting in or out of the relative to the drive shaft pivotable blade. Thus, in one direction of rotation, the pivoting knives are urged into the swung-out position by the force exerted by the food to be churned, crushed or stirred, in which swung-out position the overall substantially cross-shaped arrangement of the knives is preferred. With the reversal of the direction of rotation, the two movable knives are preferably displaced over the force of the food acting on the knife set and displaced into the superimposition to the two further knives fixed opposite them. To be able to remove, for example, tough foods, such as doughs, better from the, the knife set having mixing vessel, can be done with completion of the stirring or kneading by means of the knife set reversing the direction of rotation in accordance with the direction of rotation according to the pivoting knife under quasi support on the dough in the superimposition are turned to the other knives.

Furthermore, the invention relates to a rotary drivable knife set for a food processor, in particular electromotrically operated food processor, with two about a rotation axis rotatably driven and opposite the axis of rotation arranged knives, which are arranged one above the other in the direction of the axis of rotation and based on the same direction of rotation on one side a cutting edge and on the other side have a blunt formed opposite the cutting edge cutting back.

Knife sets of the type in question are known. In this regard, reference is made to the literature mentioned above.

In view of the known prior art, a technical problem of the invention is seen in a knife set of the type in question in an advantageous manner to further improve.

A possible solution to the problem is given according to a first idea of the invention in a knife set, in which it is geared to that the knife can be brought into a stable superposition in the direction of the axis of rotation. According to this embodiment, a set of blades is specified, which is characterized by a use advantageous embodiment. A knife is preferably arranged so that it can pivot about the axis of rotation of the knife set relative to the second knife of the knife set, so that it can be brought from the preferred, opposing arrangement into a superimposition to the knife fixed relative thereto. In this case, the pivotable knife dips in a preferred embodiment under the relatively fixed knife or covers this.

More preferably, both pivot positions of a knife, d. H. the swing-out position of the one blade for forming a substantially opposite arrangement of both blades to each other and the pivoting position in the overlay stable, further in particular during operation of the blade set, d. H. stable on rotation. This is achieved in one embodiment, according latching of a pivoting blade in one or the other pivotal position. Such a lock can be brought about by the user. In an alternative and preferred embodiment, the respective stable position is achieved by a stop limit of a knife in the direction of rotation of the blade set or contrary to the usual direction of rotation of the same. For this purpose, it is further preferred that the relative to the pivoting knife fixed knife is rotatably connected to the drive shaft of the knife set, while a knife is preferably arranged relative to the drive shaft to this pivotally, but limited stop.

Further, according to this embodiment, given the possibility, in the pivoted position of a knife, more preferably in an approximately diametrically opposite position relative to the knife fixed relative thereto, the knife set with the same direction of rotation of the same for cutting or chopping food using the in the same Use direction of rotation facing cutting edges of both knives. In particular, in the pivoted position of a knife, in which this is spent in superimposition to another knife, accordingly, the cutting edges are substantially in superimposition, as well as the cutting backs. As a result of this superimposition, the passage area for food is markedly reduced, in particular in the area of the fixed knife, in relation to the pivoted-out position of the movable knife. This offers particular advantages in a opposite to a cutting process opposite turning of the blade set, in which rotation now act on the food substantially overlying in the extension direction of the rotation axis cutting backs. This results in a relation to the usual stretched position of the two knives improved stirring effect.

The features of the above-described, independent claims 1 and 2 are both in each case substantially, as well as in any combination with each other, further features of an independent claim 1 or 2 with the features of the further independent claim 1 or 2, further with only individual features the further independent claim 1 or 2 can be combined.

Further features of the invention are explained below, also in the description of the figures, often in their preferred association with the subject matter of claim 1 and / or claim 2 or with features of further claims. But they can also be in an assignment to only individual features of claim 1 and / or claim 2 or the respective further claim or each independently of importance.

The cutting edge of each blade is formed with a reference to a perpendicular to the radial orientation of the knife considered vertical section tip side of a correspondingly shaped cutting edge. The cutting edge preferably includes a so-called wedge angle of 0.5 to 15 degrees, in particular to a substantially flat surface of the knife blade. In this case, furthermore, the knife-starting from the cutting edge-has a continuous or discontinuous increase in the knife thickness in the direction of the facing cutting back, so more preferably at least over a dimension of 3 to 10 mm, considered essentially transversely to the radial extent of the knife. More preferably, the thickness of the knife in a distance range of 2 to 5 mm to the cutting edge is preferably 1/10 to 5/10 of the thickest thickness of the knife, especially in the region of the cutting back.

The cutting spine is preferably formed by a surface directed substantially perpendicular to the longitudinal extent of the knife, or a surface thereof which encloses an acute angle of up to 10 degrees to a knife surface. Also, in this respect a considered in cross-section rounding or spherical shaping is possible. In addition, the cutting back preferably extends over the entire blade thickness as well as more preferably over the entire radial extension of the blade.

In a further preferred embodiment, it is provided that in each case two upper and two lower blades are rigidly connected to each other. This results in corresponding pairs of knives, wherein preferably each pair of knives is composed of two with respect to the axis of rotation substantially diametrically opposite knives. These knife pairs are arranged one above the other at least in the region of the connection to the drive axis or in the area surrounding the drive axis at least with respect to the extent of the rotation axis, more preferably in particular in this axis area one above the other. With extending from the axis of rotation radial extension of the knife, the superposition of the knife pairs is preferably maintained, although, as further preferred, the blades - starting from the axis of rotation or from the drive shaft - each extending in the course of the radial expansion in different transverse planes to the axis of rotation.

Furthermore, a cutting edge is preferably concave in its longitudinal extent such that it extends further back in the direction of rotation at an average radius than at a larger and / or smaller radius. In this case, the average radius is preferably the region of the maximum retraction of the cutting edge in relation to a line connecting the cutting edge ends considered in the radial direction. This results in a preferably sickle-shaped design of the cutting edge. In one embodiment, all knives are provided with such a concave cutting edge. Alternatively, not all knives have such a concave cutting edge. Preferred is an embodiment of the knife set, in which two or three knives have such a concave cutting edge, wherein preferably in particular the upper pair of knives is provided with such concave cutting edges.

In a further preferred embodiment, at least the cutting edge of a knife, more preferably a lower, pivotable knife is designed to extend substantially rectilinear overall, wherein further preferably with respect to a plan this cutting edge forms an acute angle of 2 to 10 degrees to a radial.

A cutting back is convex in a preferred embodiment, so further preferably at least over a portion of the radial extent of the blade. In a further preferred embodiment, the cutting ridge of a knife is composed of a radially inner rectilinear section, more preferably approximately parallel to a radial section, and a convex section adjoining this radially outward. It is also preferred in this regard that at least the cutting back of a knife, more particularly of a lower knife, extends in a straight line over at least the major part of the radial extent.

In a further preferred embodiment, the cutting backs remove in superposition radially outward in the direction of the axis of rotation with increasing radius from each other. In this case, a distance dimension considered in the rotational axis extension is preferably taken, which corresponds to 1/10 to 2/3 of the radial extent of a knife, starting from the axis of rotation to the radially outer end. In this case, the distance further increases, preferably starting from radially inner to radially outer, uniformly. At least with two knives lying one above the other, the maximum distance dimension in the direction of the axis of rotation in the area of the free knife ends is reached.

Further preferably, it is provided that the cutting backs in superposition radially first in the direction of the axis of rotation with increasing radius first from each other and then approach again. In this context, it is further preferred that the degree of closest approach of the cutting ridges of two superimposed knives is achieved at initially mutually distant cutting back in the region of the radially outer ends of the superimposed knife.

In addition, it is provided in a preferred embodiment that the course of the edges of the blades is different in a projection perpendicular to the axis of rotation. In this case, both the marginal edges of the cutting edges and the marginal edges of the cutting backs preferably extend differently from one another. In this case, according to the superposition of the knives, a forward or backward edge of a knife relative to the marginal edges of the knife arranged above or below can result, wherein it is in any case preferred that in the superposition of two knives a covering of the knife surfaces of FIG at least 40 to 80 percent up to 100 percent results.

With regard to the disclosure, the ranges and / or ranges of values or multiple ranges given above also include all intermediate values, in particular in 1/10 increments of the respective dimension, if appropriate also dimensionless, in particular 1.01-fold, etc., on the one hand to limit the abovementioned Range limits from below and / or above, alternatively or additionally but also with regard to the disclosure of one or more singular values from the respectively specified range.

The invention will be explained with reference to the accompanying drawing, which illustrates only one embodiment. On the drawing shows:

1 a food processor in view with a mixing vessel and arranged in the mixing vessel knife set;

2 the top view of the knife set;

3 the view against the knife set according to the arrow III in 2 ;

4 the side view against the knife set according to the arrow IV in 2 ;

5 the section along the line VV in 3 ;

6 an exploded perspective view of the knife set;

7 a plan view according to 2 However, a pivoting position of two knives in a superposition to the other knives concerning;

8th one of the 5 corresponding sectional view, but the position according to 7 concerning;

9 a side view according to 3 , but the pivoted position according to 7 concerning;

10 another side view as shown in FIG 4 , concerning the pivoted position of the knives.

Shown and described is first with reference to 1 a food processor 1 , in particular for processing and processing food, more preferably for use in the household sector.

The food processor 1 has a housing 2 on with a vascular receptacle 3 , In this is a mixing vessel 4 adjustable.

In the area of a control panel 5 are essentially a rotary switch 6 as well as various pushbuttons 7 provided, in particular for the adjustment of processing parameters by the user. The over the rotary switch 6 and / or pushbuttons 7 to be set parameters are preferably on one in the control panel 5 arranged display 8th displayable.

In particular, via the rotary switch 6 is a speed of one in the mixing vessel 4 arranged agitator in the form of a knife set 9 adjustable.

The knife set 9 is preferred in the region of a Rührgefäßbodens 10 attached, so on preferably a corresponding opening in the mixing vessel bottom 10 enforcing on the ground 10 set in a bayonet.

About one over the bottom of the mixing vessel bottom 10 freely protruding coupling driver 11 and a correspondingly adapted coupling receptacle 12 in the case 2 is the knife set 9 can be driven to rotate about an axis of rotation x. For this purpose, the housing-side coupling receptacle 12 rotatably with a drive shaft of an electric motor, not shown 13 connected.

The power supply, in particular of the electric motor 13 , in addition to a possibly provided heating, as well as preferably for those in the food processor 1 provided electronics is provided via a power cord 14 ,

By means of the ground-level knife set 9 , which according to the above-described arrangement together with the mixing vessel 4 from the vessel receptacle 3 can be removed, are food or cooking goods in the mixing vessel 4 comminuted or are mixed or kneaded over this.

Especially in the operation of the knife set 9 , In addition, if appropriate, also during operation of the preferred heating provided, is the mixing vessel 4 from a lid 15 flashed. This is further preferred in the operation of the food processor 1 at the mixing vessel 4 and / or on the housing 2 locked.

The example in 2 illustrated knife set 9 or the agitator formed thereby initially has a fixing section 16 on, for non-rotatably fixing the agitator on the Rührgefäßboden 10 , The fixing section 16 is centrally interspersed with a wave 17 , on which underside, ie in assignment position of the knife set 9 in the mixing vessel 4 , below the bottom of the mixing vessel 10 det rotatably with the shaft 17 connected clutch driver 11 is provided.

The wave 17 When viewed centrally in its longitudinal extension, the axis of rotation x is assumed, which axis of rotation x preferably also forms the central mixing-vessel axis running vertically in the assignment position.

About the wave 17 In the illustrated embodiment, a total of four knives 18 to 21 rotated around the axis of rotation x.

Here are two knives each 18 and 19 respectively 20 and 21 rigidly connected to each other, more preferably integrally formed and of uniform material.

With respect to the axis of rotation x, the blades of each pair of blades extend 22 . 23 preferably in the diametrical direction.

With respect to the extent of the axis of rotation x or the shaft 17 form the knives 20 and 21 a lower knife pair 22 and the knives 18 and 19 a vertical upper pair of knives 23 ,

All knives 18 to 21 with respect to a direction of rotation r of the knife set 9 about the rotation axis x at the edge directed in the direction of rotation r 24 a cutting edge 25 on.

This cutting edge 25 is part of a respective cutting edge 26 , where the cutting surface 27 a wedge angle of 1 to 5 degrees to a preferably flat surface of the respective knife blade 28 includes.

The edge facing away in the direction of rotation r 24 of every knife 18 to 21 forms a cutting back 29 out. This cutting back 29 is opposite the cutting edge 25 formed blunt, more preferably one to the surface of the knife blade 28 preferably having vertically oriented back surface. This back surface more preferably corresponds in its at least approximately parallel to the rotation axis x considered strength of the material thickness of the respective knife. More preferably, the cutting back 29 a related strength, which is 10 to 30 times the material thickness in a 1 to 2 mm to the cutting edge 25 spaced area of the cutting edge 26 equivalent.

The cutting edges 25 the knife 18 and 19 of the upper knife pair 23 are furthermore preferably concave in the direction of rotation r. Starting from a central, preferably transverse to the axis of rotation x aligned blade connection area 30 of the upper knife pair 23 extends the cutting edge 25 such that a connecting line a between the viewed in the radial direction of the extension of the beginning of the concave cutting edge 25 and the concave end of the same in extension of the direction of rotation r facing edge of the blade connection area 30 (With respect to a projection perpendicular to the axis of rotation x) or viewed in the direction of rotation r behind an extension of the corresponding edge of the blade connection area 30 runs.

Further, the concave configuration of the cutting edge is chosen so that it is set back on a middle radius relative to the axis of rotation x in the direction of rotation r further than on a smaller radius, for example, at the beginning of the concave profile, as well as to a larger radius, for example to the end the concave course of the cutting edge 25 , The mean radius is here the point at which the area of maximum receding of the cutting edge 25 relative to the line a is recorded.

Further proceeding from the blade connection region oriented essentially transversely to the axis of rotation x 30 the knife extends 18 under a crank of about 30 to 45 degrees to align the blade connection area 30 upward to thereafter subsequently inclined approximately at an angle of 10 to 15 degrees in the direction radially outward inclined downwards.

The opposite knife 19 however, is at the blade connection area 30 connected via a first at an angle of 30 to 45 degrees downwardly directed Kröpfungsabschnitt, at which then radially outward above the knife 19 extends at a pitch angle of 10 to 15 degrees.

More preferably, the cutting edges extend 25 the knife 18 and 19 alone or at least over 60 to 90 percent of the cutting length in the area radially outside the Kröpfungsabschnitte the knife pair 23 ,

The lower knife pair 22 is in a preferred basic position, which basic position, as explained in more detail below, upon rotation of the blade set 9 in the direction of rotation r preferably sets itself automatically, at least approximately at a 90 degree angle to the upper knife pair 23 arranged, this at least what a central blade connection area 31 concerns.

The blade connection area 31 extends on both sides, starting from the axis of rotation x, as well as preferably the blade connection area 30 of the upper knife pair 23 , at least until a vertical overlap to the peripheral edge of the attachment portion 16 in its maximum diameter range.

That the knife 21 facing the end of the blade connection area 31 preferably extends with inclusion of an acute angle of about 15 degrees to an axis parallel, downward and pointing radially outward, further this bent portion is preferably aligned approximately parallel to a circumferential wall of the overall preferred frusto-conical attachment portion 16 ,

The Kröpfungsabschnitt extends approximately to half the vertical height of the attachment section 16 and goes over here in the knife 21 which is described with reference to a side view as shown in FIG 4 about an acute angle of 10 to 15 degrees to a lower bearing surface of the fixing portion 16 includes, pointing radially outward. The inclination and the free length of the knife 21 - In particular, starting from the Kröpfungsabschnitt - is chosen so that the free end of the knife 21 at a small vertical distance to the lower bearing surface of the fixing section 16 extends, thus correspondingly in assignment position of the knife set 9 in the mixing vessel 4 with a small vertical distance to the facing surface of the Rührgefäßbodens 10 ,

The knife 21 is a total - more preferably starting with the Kröpfungsabschnitt - formed with respect to a projection perpendicular to the axis of rotation x circular section. The radius of this circular section shape preferably corresponds to about 0.7 to 1.2 times the radial length of a blade 18 respectively 19 , starting from the axis of rotation x.

The curvature of the knife 21 is chosen so that the pointing in the direction of rotation r cutting edge 25 is formed convex, while in the direction of rotation r facing away from the cutting back 29 has a concave shape.

The knife 21 with respect to the rotation axis x opposite crank also extends preferably under approximately parallel alignment to the circumferential conical wall of the fixing section 16 , but here preferably at least approximately to the level of the lower bearing surface of the fixing section 16 from where the radially outwardly preferably aligned parallel to the above-described plane knife 20 joins. Accordingly, the knife moves 20 during operation of the knife set 9 at a slight distance above the surface of the facing Rührgefäßbodens 10 ,

The cutting edge 25 of the knife 20 extends with respect to a plan view according to 2 at an acute angle of 15 to 30 degrees to the edge of the blade connection area viewed in the direction of rotation r 31 , this under in the direction of rotation r considered re-displacement of the cutting edge 25 to the aforementioned edge of the blade connection area 31 ,

In conjunction with the substantially in radial extension with the peripheral edge of the blade connection area facing away in the direction of rotation r 31 formed cutting back 29 This results in an approximately wedge-shaped layout of the blade 20 ,

The cutting backs 29 the upper knife 18 and 19 extend initially in extension of the direction of rotation r facing away from the edge of the blade connection area 30 to get about 2/3 of her Radial extension to go into a convex end portion. This results in total with respect to a plan view according to 2 sickle-shaped knives 18 and 19 ,

The cutting edges 25 of each knife extend in a further preferred embodiment, at least in some sections, into the respective associated offset area.

The two knives 18 and 19 or the upper knife pair formed thereby 23 is rotatable with the shaft 17 connected. The lower knives 20 and 21 or the lower knife pair formed thereby 22 however, is from the wave 17 centrally in the area of the blade connection area 30 interspersed, relative to the upper knife pair 23 pivotable, so preferably from a cross-shaped alignment of the knife 18 to 21 as shown in 2 in an approximately superimposition of the two pairs of knives 22 and 23 as shown in 7 ,

Both rotary end positions of the knife pair 22 are stop limited. For this purpose, the blade connection area 31 of the lower knife pair 22 a relation to the shaft diameter enlarged breakthrough 32 on. Through this, the shaft attacks 17 , which has a preferred square recess 34 in the blade connection area 30 rotatably with the upper pair of knives 23 connected is.

Wandungsaußenseitig one formed below the wave-side square, to the diameter of the aperture 32 adapted circular cylinder section 36 are diametrically opposite to radially outwardly projecting stop ribs 34 formed, which in concentric with the axis of rotation x extending, circular segment-shaped grooves radially outside of the opening 32 intervention. After vertical above the knife assembly is secured by a with the shaft 17 or the square rotatably connected headboard 37 ,

In cooperation of stop ribs 34 of the upper knife pair 23 and grooves 35 of the lower knife pair 22 a stop limit is given in both pivoting directions about the axis of rotation x, wherein a pivotability of the lower knife pair 22 of preferably about 90 degrees to the axis of rotation x is possible.

The displacement of the lower knife pair 22 and thus the knife 22 and 21 from the one stop-limited position in the other and vice versa, for example, by the user by hand feasible.

Preferred is the desired pivot position of the lower knife pair 23 with commissioning of the knife set 9 in the mixing vessel 4 reached automatically located medium.

This is how the knife set turns 9 in the direction of rotation r, for example, for cutting hard foods, such as nuts, etc., the knife 20 and 21 by the force exerted by the food on the rotating knives force in the pivoted position according to 2 urged, this against the stop, formed by hitting the ribs 34 on the related radial edge of the grooves 35 ,

The cutting edges 25 the knife 18 to 21 act accordingly in the direction of rotation r at least approximately evenly distributed on different vertical levels on the food, for the same effective comminution.

In particular, for stirring of substantially liquid food is a reversal of the direction of the knife set 9 brought about, this preferred according to the appropriate setting on the rotary switch 6 , Accordingly, the force acts in the mixing vessel 4 food now on the opposite the cutting edges 25 blunt cutting back 29 the knife 18 to 21 which leads to a relative rotational displacement of the lower knife pair 22 in a superimposition to the relatively fixed upper pair of blades 23 leads (compare 7 ).

Also this position is stop limited according to striking the ribs 34 at the now associated radial edges of the grooves 35 ,

In particular, the cutting backs acting on the food 29 are now arranged in a superimposition, the knife set 9 In this position, a total of elongated forms on both sides of the axis of rotation x.

Due to the superposition of knives 20 and knives 19 This results in an arrangement of the cutting backs in this area 29 in which they move radially outward in the direction of the axis of rotation x with increasing radius of each other, while the cutting back 29 the other two superimposed knives 18 and 21 initially move radially outward with increasing radius and then approach again.

The effective passage area in the region of a vertical and radially aligned plane in operating position, which preferably passes through the superimposed knife centrally, is reduced or divided by the superposition of the knife. This leads to a significantly improved stirring result according to a clear improved wave on the surface of essentially liquid foods.

As a further advantageous effect, the position of the pairs of blades in superimposition according to proves 7 when emptying the mixing vessel 4 , It is in this position a much improved removal of the food, such as a viscous dough or the like in particular accessible from the bottom area, since the pairs of blades 22 and 23 in a minimal overlap to the Rührgefäßboden 10 spent.

Thus, for example, for the removal of a food for a short time a change of direction of the knife set 9 be performed in the direction of rotation r ', so the pairs of blades 22 and 23 to spend in the superimposition.

All disclosed features are essential to the invention. The disclosure of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application. The subclaims characterize in their optionally sibling version independent inventive developments of the prior art, in particular to make on the basis of these claims divisional applications.

LIST OF REFERENCE NUMBERS

1

food processor

2

casing

3

vessel reception

4

mixing vessel

5

control panel

6

rotary switch

7

pushbutton

8th

display

9

knife set

10

mixing-vessel

11

coupling driver

12

Kupplungsaufnahme

13

electric motor

14

Power cord

15

cover

16

setting section

17

wave

18

knife

19

knife

20

knife

21

knife

22

pair of blades

23

pair of blades

24

edge

25

cutting edge

22

cutting edge

27

cutting surface

28

knife blade

29

cutting back

30

Diameter connection area

31

Diameter connection area

32

breakthrough

33

square recess

34

stop rib

35

groove

36

Circular cylindrical section

37

headboard

a

line

r

direction of rotation

r '

direction of rotation

x

axis of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1639928 B1 [0002]

Claims (8)

Rotatable Knife Set ( 9 ) for a food processor ( 1 ), in particular an electromotrically operated food processor, with four knives which can be driven in rotation about an axis of rotation (x) ( 18 to 21 ), characterized in that two of the knives ( 20 . 21 ) about the axis of rotation (x) of the knife set ( 9 ) are pivotable in a position in which they at least partially in the direction of the axis of rotation (x) in a stable superimposition to the other two knives ( 18 . 19 ) are. Rotatable Knife Set ( 9 ) for a food processor ( 1 ), in particular electromotrically operated food processor, with two around a rotational axis (x) rotatably driven and with respect to the axis of rotation (x) opposite arranged knives, which are arranged one above the other in the direction of the axis of rotation (x) and based on the same direction of rotation (r) on the one Side a cutting edge ( 25 ) and on the other side one opposite the cutting edge ( 25 ) butt-formed cutting backs ( 29 ), characterized in that the knives can be brought into a stable superimposition in the direction of the axis of rotation (x). Knife set according to one or more of the preceding claims or in particular according thereto, characterized in that in each case two upper ( 18 . 19 ) and two lower knives ( 20 . 21 ) are rigidly connected to each other. Knife set according to one or more of the preceding claims or in particular according thereto, characterized in that a cutting edge ( 25 ) is concave in such a way that it extends further back on a middle radius in the direction of rotation (r) than on a larger and / or smaller radius. Knife set according to one or more of the preceding claims or in particular according thereto, characterized in that a cutting back ( 29 ) is convex. Knife set according to one or more of the preceding claims or in particular according thereto, characterized in that the cutting backs ( 29 ) in superposition radially outward in the direction of the axis of rotation (x) with increasing radius from each other. Knife set according to one or more of the preceding claims or in particular according thereto, characterized in that the cutting backs ( 29 ) in superimposed radially outward in the direction of the axis of rotation (x) with increasing radius first from each other and then approach again. Knife set according to one or more of the preceding claims or in particular according thereto, characterized in that the course of the marginal edges ( 24 ) the knife ( 18 to 21 ) is different in a projection perpendicular to the axis of rotation (x).

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