Meat grinder blades with interchangeable blades arranged on both sides, and blade arrangement in a meat grinder

Abstract

Meat grinder blade (10) with a blade carrier (12) having an entry side (E) and an exit side (A), wherein the blade carrier (12) has at least one blade wing (14) on both the entry side (E) and the exit side (A), and wherein at least one blade (16) is arranged replaceably in each of the at least one blade wing (14), wherein the blade (16) has a cutting edge (18) and a blade back (20) opposite the cutting edge (18), and wherein a groove (22) is formed in the blade wing (14) for the arrangement of the blade (16) in the blade wing (14), characterized in that the blades (16) on both the entry side (E) and the exit side (A) are mounted in a pivoting manner insofar as the blade back (20) and / or the groove base (24) is / are shaped in an arc such that the blade back (20) a middle section on the groove base (24) can pivot and / or slide.

Description

[0001] The invention relates to a meat grinder knife with interchangeable blades arranged on both sides, as well as to a knife assembly with such a knife in a meat grinder. Meat grinder knives are known in practice that have an inlet side and an outlet side, wherein the conveying direction within a meat grinder is the direction in which the material to be minced is conveyed. The material to be minced, in particular fresh meat, is conveyed from the inlet side to the outlet side of the respective cutting assembly part. The meat grinder knife relating to the invention has at least one blade on the inlet side and at least one blade on the outlet side, wherein the blades are arranged so as to be interchangeable. Such interchangeably arranged blades are also referred to as interchangeable blades.Furthermore, the invention relates to a knife arrangement in a meat grinder with two perforated discs and a meat grinder knife arranged between and immediately adjacent to these perforated discs. Reference is also made to meat grinders with such an arrangement and to the use of such meat grinders for mincing fresh meat and / or other foods or substances.

[0002] DE 625 914 A discloses a knife for meat grinders which has one or more replaceable, self-adjusting blades. The blades have a circular arc-shaped contour on the back and are arranged such that they completely penetrate the knife carrier and protrude from the knife carrier on both sides. A disadvantage is that the blades are inadequately secured against falling out and can fall out when a cutting set is installed. A further disadvantage is that the blades are arranged so that they completely penetrate the knife carrier in the central area and that, due to the type of arrangement of the blades, the force is introduced in the area of ​​the respective blade tip on the inlet side and on the outlet side of the knife - viewed in the radial direction - at different points.

[0003] DE 802 044 A discloses a meat grinder knife with interchangeable blades. The blades are clamped in place by a spring-loaded clamping element inserted into the knife holder. These blades are secured by means of lower and upper lugs, each extending into the knife holder on one side. A disadvantage is the relatively complex assembly, in which the blades are first pushed with a forked end under the upper lugs, then pivoted, and then the opposite end of the blades is pushed under the lower lugs. Nothing is described or shown regarding the shape of the blades.

[0004] The knife carriers of the meat grinder knives disclosed in DE 625 914 A and DE 802 044 A each have a three-bladed design. The meat grinder knives disclosed in DE 625 914 A and DE 802 044 A from 1932 and 1949 have not been widely adopted in practice.

[0005] DE 10 2008 019 812 A1 discloses a mincing knife with inserted blades, in which blades with cutting edges formed thereon are inserted only on one side into a groove formed in a knife wing. The blades are fixed on the side opposite the cutting edge with the help of shaped elements. The shaped elements interact with negative shaped elements formed in the groove base in such a way that displacement of the blade along the longitudinal axis of the groove or the longitudinal axis of the blade is prevented. The knife disclosed in DE 10 2008 019 812 A1 was used in practice exclusively as a pre-shredder. Such pre-shredders are used in a meat grinder as the first cutting element in front of a first perforated disc, viewed in the conveying direction.

[0006] The invention is based on the object of providing a knife with interchangeable blades arranged on both sides, as well as a knife assembly in a meat grinder, which can achieve high-quality cutting performance. Furthermore, the knife blades should be easily replaceable.

[0007] A meat grinder knife according to the invention has a knife carrier which has an inlet side and an outlet side. The knife carrier can be made of one or more parts. The knife carrier is preferably made of one piece and is manufactured as a cast part. More preferably, the knife carrier has a circular support ring which connects the outer sides of the knife wings to one another in a circular arc. The knife carrier of a meat grinder knife according to the invention has at least one knife wing on the inlet side and at least one knife wing on the outlet side. At least one replaceable blade is arranged in each of the at least one knife wing, the blade having a cutting side and a blade back opposite the cutting side, and a groove is formed in the knife wing for arranging the blade in the knife wing.Furthermore, the blades on the entry and exit sides are each mounted in a pendulum-like manner, in that the blade spine and / or the groove base are curved in such a way that the blade spine—at least a central section—can pivot and / or slide on the groove base. During pendulum pivoting, the blades move, in particular, over a virtual center point and pivot (pendulum) in the groove base.

[0008] In this context, "arc-shaped" does not necessarily mean the shape of a circle. The term "arc-shaped" also includes contours with other arc-like curvatures that enable the blades used to swing in a manner that allows them to adapt to the curvature of an adjacent perforated disc. Within the meat grinder, pressure is usually exerted in the direction of travel, causing the perforated discs to bend. The better the cutting results, the more precisely the blades of a cutting set element can move across the (as complete as possible) surface of the adjacent perforated disc. By pivoting the blades, the blade can move in an oscillating manner into an optimal position during the mincing process. Depending on the deflection of the perforated disc, the blade moves against the disc in such a way that the pressure is evenly distributed.The blades can also be described as pendulum blades. This results in even wear on the knife, especially because it prevents the knife from wearing more on the outside than on the inside. This results in a high-quality cut while maintaining a long service life.

[0009] If the groove base and / or the blade back are circular in shape, radii of R20 to R150, preferably R40 to R100, and particularly preferably R49 to R84, have proven advantageous. Consistent radii are preferably formed on both the groove base and the blade back.

[0010] In another practical design, identically designed blades are used on both sides of the meat grinder knife. This has the advantage of reducing the number of parts required for the meat grinder and keeping manufacturing costs low. It also allows the installation side (inlet and outlet sides) to be changed regularly to test whether this results in even longer service life, depending on the application.

[0011] In another practical embodiment, the corners in the groove base are freed to the extent that they each have a free cut. In this case, the blades inserted into the groove can be sharp-edged and do not necessarily need to be deburred or chamfered.

[0012] If at least one blade has a structurally predetermined range of rotation, it can be ensured that the blades are not inserted or mounted incorrectly. A structurally predetermined range of rotation can be created in particular by means of a bolt and a corresponding opening, with one of the elements being provided on the blade and the other on the knife carrier, in particular in the area of ​​the groove of a knife wing. If a circular opening designed complementary to the bolt diameter is provided as the opening, the range of rotation is a pivot point. If an elongated hole is formed as the opening, a range of rotation remains which can also allow a certain freedom of movement of the blade in the radial direction. This is the preferred variant because it allows manufacturing tolerances to be compensated for and also because the adjustment options of the blade relative to the perforated disc can be further increased.This allows for longer service life and even better quality cutting results.

[0013] If the at least one blade has a structurally predetermined range of movement for the pivoting movement and / or sliding movement, it can be ensured that the movement in the radial direction is limited to a certain range of movement. This can be ensured in particular by internal and external stops within the groove. An outer support ring of the blade carrier can serve in particular as the external stop. A hub area of ​​the blade carrier can serve in particular as the internal stop. Alternatively or in addition to this, corresponding stops can also be formed within the groove in order to limit the movement of the blade in the radial direction within the groove.

[0014] If the rotation range or range of motion is designed off-center in such a way that the blade can only be inserted into the blade holder in one direction, simple design measures can increase application safety. This is particularly important because, depending on the installation direction, a different cutting angle and blade arrangement result, although only one arrangement is technically feasible and desirable.

[0015] In a further practical embodiment of a meat grinder knife according to the invention, the blades are fastened magnetically, by frictional force and / or positively within the groove in such a way that they do not fall out when the meat grinder knife is installed in a meat grinder, but remain freely movable during the cutting process. This enables simple assembly while simultaneously ensuring high application reliability. Fixing by frictional force can be achieved in particular by designing the thickness of the blades and the width of the groove as a transition fit, whereby additional securing measures can optionally be provided, in particular a wedge-shaped design of the groove in the depth direction and a corresponding wedge-shaped design of the blade in the insertion direction.

[0016] It has been shown that, from a manufacturing and process perspective, it is preferable for the blades to protrude 4 to 5 mm from the outer surface of the blade carrier. This design allows the size of the blades to be kept small, while still leaving a sufficiently large projection to allow the blades to be pulled out of the groove by hand without the need for an additional gripping tool.

[0017] Preferably, at least one groove on the inlet side and at least one groove on the outlet side are arranged at least partially in the same radial cutting plane such that a web thickness of at least 3 mm remains between the grooves. This allows the material and thus also the weight and manufacturing costs of a knife carrier to be kept low, while at the same time ensuring sufficient rigidity and strength of the knife carrier. The arrangement in at least partially the same radial plane has the advantage that the force application points of the blades on the inlet side and on the outlet side - viewed in the radial direction - can be arranged close to one another. This results in a positive, low-moment load on the knife carrier. The web thickness is preferably between 3 mm and 4 mm.

[0018] In order to achieve particularly good cutting results, it is preferred if the blade and the groove are each matched to one another in such a way that when the blade is inserted into the groove - in particular regardless of the current radial position of the blade and its pivoting angle - a chamfer formed on the blade has a clearance angle α of between 5° and 15° relative to a plane perpendicular to the conveying direction.

[0019] In a further practical embodiment, which also achieves particularly good cutting results, the blade and the groove are each matched to one another in such a way that when the blade is inserted into the groove, the wedge angle β formed between a longitudinal side of the blade leading to the blade tip and a plane perpendicular to the conveying direction is between 45° and 55°.

[0020] The following technical details, particularly those provided in addition to the above embodiments, also lead to particularly good cutting results. - The groove is designed in such a way that the blade can be inserted into the groove with a cutting angle γ between 50° and 60°. - A bevel formed on the blade has a length between 4 mm and 5 mm. - The thickness of the blade is between 3.5 mm and 4.5 mm.

[0021] In a further practical embodiment of a meat grinder knife according to the invention, the blade is made of a hardenable and magnetizable knife steel, because then, on the one hand, a particularly simple and therefore preferred attachment of the blade can be achieved with the aid of one or more permanent magnets, which can be inserted in the area of ​​the knife carrier, in particular directly in the groove base or in the side walls bordering the groove. Furthermore, the blade can be hardened to further increase its service life and improve its wear resistance, especially for chopping objects of greater hardness.

[0022] Preferably, the blade is hardened to a hardness of at least 50 HRC. By applying at least one PVD coating or CVD coating, the hardness and / or wear resistance can be further increased.

[0023] Preferably, the meat grinder blade is designed to be used in a smooth cutting system. This allows for particularly simple and cost-effective machining.

[0024] The invention also relates to an arrangement of a meat grinder knife as described above in a meat grinder between a first perforated disc arranged on the inlet side and a second perforated disc on the outlet side, such that the at least one blade arranged on the inlet side and the at least one blade on the outlet side are arranged at least partially adjacent to the perforated disc. It has been shown that such an arrangement allows for particularly high-quality cutting results, which, due to the specific arrangement of the blades mounted on both sides in a pendulum motion, have a particularly long service life.

[0025] The length and arrangement of the blade are preferably designed such that, in the final assembly state, the blade extends completely over the cutting area defined by the arrangement of the through-holes on the first and second perforated discs. Accordingly, only one blade needs to be arranged in a blade wing of a cutting set to operate the meat grinder in the conventional manner.

[0026] Further practical embodiments and advantages of the invention are described below in conjunction with the drawings. They show: Fig. 1 an exemplary embodiment of a meat grinder knife according to the invention in a view from the inlet side, Fig. 2 the meat grinder knife in Fig. 1 in a view according to arrow II in Fig. 1 Fig. 3 the meat grinder knife from the Fig. 1 and Fig. 2 in a view from the exit side opposite the inlet side, Fig. 4 the meat grinder knife from the Fig. 1 and Fig. 2 in a view according to arrow IV in Fig. 1, Fig. 5 a section through the knife carrier of the Fig. 1 to 4 in the area where the two blades are at the smallest distance from each other, Fig. 6 a section through the knife carrier of the Fig. 1 to 4 in an off-center area, where one of the blades has a through-hole for positive fixing by means of a bolt, Fig. 7 the in Fig. 4 area marked VII in an enlarged view, Fig. 8 the meat grinder knife from the Fig. 1 to 4 in an arrangement in front of a perforated disc facing the entry side of the knife, Fig. 9 the arrangement Fig. 8 in a side view, Fig. 10 an enlarged view of the Fig. 9 area marked with X rotated 90° clockwise to show cutting angle, clearance angle and wedge angle, Fig. 11 an isometric view of the meat grinder blade from the Fig. 1 to 10, Fig. 12 an isometric view of a meat grinder knife of the Fig. 1 to 11 inserted blade with a view of the bevel and the blade tip as well as Fig. 13 an isometric view of the blade from Fig. 12 with a view of the blade spine.

[0027] In the Fig. 1 to 4 and 11 show a meat grinder knife 10 having a knife carrier 12. The meat grinder knife 10 and the knife carrier 12 have an inlet side E and an outlet side A, with the knife carrier 12 having four blade wings 14 on the inlet side E and on the outlet side A. A replaceable blade 16 is arranged on each of the inlet and outlet sides of each blade wing 14. Each blade 16 has a cutting side 18 and a blade spine 20 opposite the cutting side 18, with a groove 22 being formed in the blade wing 14 for arranging the blade 16 in the blade wing 14.

[0028] As particularly in Fig. 1, the blades 16 on the inlet side E and on the outlet side A are each mounted in a pendulum manner in that the blade back 20 and a groove base 24 forming the bottom of the groove 22 are curved in such a way that the blade back 20 can pivot and / or slide in a pendulum manner with a central section on the groove base 24.

[0029] The groove 22 with groove base 24 are shown in the enlarged illustrations of the Fig. 5 and Fig. 6 clearly visible. Fig. 5 shows a section through a knife wing 14 in the area where two grooves 22 approach each other except for a small central web 26 with the web thickness s. This is in the middle area of ​​the two blades 16, where the thickness of the blades, which are curved in the area of ​​the blade spine, is greatest.

[0030] In Fig. In Figure 5, the left groove 22 is shown as an example of a free-standing groove 22, which has a free space 46 in each of its two corners. This was created by a relief cut in the area of ​​the respective corner.

[0031] Fig. 6 shows a different cutting plane, which is selected such that it leads through a through-opening 28 formed in the blade 16 for the penetration of a bolt (not shown). Also visible in this cutting plane is a bolt opening 36, which serves to introduce a bolt as a positive locking element into the blade wing and to penetrate the through-opening 28 of a blade 16 brought into the installed position. A screw (not shown) can in particular serve as the bolt. Alternatively, a cylindrical bolt (not shown) can be introduced, in particular pressed in.

[0032] In the Fig. 5 and Fig. 6 clearly shows that the blades 16 each have a bevel 30 leading to a blade tip 32. The blade tip 32 is formed by a linear region which has the greatest distance a from the nearest outer edge 34 of the knife wing.

[0033] In the Fig. 5 and Fig. 6 it is clearly visible that the blade tips 32 of the blades 16 on the entry side E and the exit side A are arranged opposite one another, since the blades 16 are arranged mirror-symmetrically to the central axis M of the knife wing 14 - projected into a plane - in such an overlapping manner that the bevels 30 at least partially overlap.

[0034] In Fig. 7, which Fig. 4 shows an enlarged view of the area marked VII, it can be clearly seen that the blades 16 of opposite knife wings 14 - when projected into a plane - are arranged in an overlapping manner.

[0035] The Fig. 8 and Fig. 9 show various views of an assembly 40 comprising a meat grinder blade 10 arranged directly in front of a perforated disc 38. The perforated disc 38 has, in a known manner, a plurality of through-openings 42 extending over a circular ring-shaped section. A radially outwardly projecting material tab 44 is formed on the outer circumference of the perforated disc 38 and serves as an anti-twist device when inserted into a meat grinder housing (not shown). Alternatively, a recess or any other element can also be provided as an anti-twist device.

[0036] As from Fig. 10, the meat grinder knife 10 is arranged relative to the perforated disc 38 such that the blade tip 32 of the respective bevel 30 rests against the perforated disc 38.

[0037] In Fig. 10 also shows the clearance angle α, the wedge angle β and the cutting angle γ.

[0038] For the sake of completeness, it should be noted that the knife carrier 12 of the meat grinder knife 10 has a hub 46 in the central area, where the knife wings 14 meet, for the passage of a complementary shaft section (not shown). The shaft section serves to rotate the meat grinder knife 10 in the meat grinder (not shown).

[0039] From the Fig. 12 and Fig.13 shows the geometric design of the blades 16 using an example blade shown in an isometric view. The blade 16 has two parallel longitudinal sides 48, 50, a bevel 30 leading to a blade tip 32, and a blade spine 20—here in the shape of a circular arc. Furthermore, the blade 16 has a through-opening 28, which in the embodiment shown is designed as an elongated hole 52. The elongated hole is designed to run parallel to the blade spine 20 so that the blade 16 can move in the radial direction of the meat grinder knife 10 and in the longitudinal direction of the groove 20. This results in an overall pendulum mounting of the blades 16 with the simultaneous possibility for the blade 16 to position itself "pressure-optimally" in the radial direction within the groove.

[0040] The features of the invention disclosed in the present description, the drawings, and the claims may be essential, both individually and in any combination, for the realization of the invention in its various embodiments. The invention is not limited to the described embodiments. It may be varied within the scope of the claims and taking into account the knowledge of the competent person skilled in the art. List of reference symbols 10 meat grinder knives 12 knife holders 14 blades 16 blade 18 Cutting side 20 blade backs 22 grooves 24 groove base 26 jetty 28 passage opening 30 chamfer 32 blade tip 34 outer edge 36 bolt opening 38 hole disc 40 Arrangement 42 Through hole (in the perforated disc) 44 Material tab 46 Exemption a distance s web thickness A Exit side E Entrance side QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This 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

[0000] DE 625 914 A [0002, 0004] DE 802 044 A [0003, 0004] DE 10 2008 019 812 A1

[0005]

Claims

[1] Meat grinder knife (10) with a knife carrier (12) which has an inlet side (E) and an outlet side (A), wherein the knife carrier (12) has at least one knife wing (14) on the inlet side (E) and on the outlet side (A) and wherein at least one blade (16) is interchangeably arranged in each of the at least one knife wing (14), wherein the blade (16) has a cutting side (18) and a blade back (20) opposite the cutting side (18), and wherein a groove (22) is formed in the knife wing (14) for the arrangement of the blade (16) in the knife wing (14), characterized by that the blades (16) on the inlet side (E) and on the outlet side (A) are each mounted in a pendulum manner insofar as the blade back (20) and / or the groove base (24) is / are curved in such a way that the blade back (20) can pivot and / or slide in a pendulum manner with a central section on the groove base (24). [2] Meat grinder knife (10) according to the preceding claim, characterized by that identically designed blades (16) are used on both sides. [3] Meat grinder knife (10) according to one of the preceding claims, characterized by that the corners in the groove base have a clearance (46). [4] Meat grinder knife (10) according to one of the preceding claims, characterized by that at least one blade (16) has a structurally predetermined range of rotation or structurally predetermined range of movement for the pivoting movement. [5] Meat grinder knife (10) according to one of the preceding claims, characterized by that the rotation range or range of motion is provided off-center in such a way that the blade (16) can only be inserted into the knife carrier (12) in one direction as intended. [6] Meat grinder knife (10) according to one of the preceding claims, characterized bythat the blades (16) are fastened magnetically, by frictional force and / or positively within the groove (22) in such a way that they do not fall out when the meat grinder knife (10) is mounted in a meat grinder, but remain movable in an oscillating manner during the cutting process. [7] Meat grinder knife (10) according to one of the preceding claims, characterized by that the blades (16) are arranged to protrude 4 to 5 mm from an outer surface of the knife carrier (12). [8] Meat grinder knife (10) according to one of the preceding claims, characterized by that at least one groove (22) on the inlet side (E) and at least one groove (22) on the outlet side (A) are arranged at least partially in the same radial sectional plane such that a web thickness of at least 3 mm remains between the grooves (22). [9] Meat grinder knife (10) according to one of the preceding claims, characterized bythat the blade (16) and the groove (22) are each matched to one another in such a way that when the blade (16) is inserted into the groove (22), a chamfer formed on the blade (16) has a clearance angle α of between 5° and 15° relative to a plane perpendicular to the conveying direction. [10] Meat grinder knife (10) according to one of the preceding claims, characterized by that the blade (16) and the groove (22) are each matched to one another in such a way that when the blade (16) is inserted into the groove (22), the wedge angle β formed between a longitudinal side of the blade (16) leading to the blade tip and a plane perpendicular to the conveying direction is between 45° and 55°. [11] Meat grinder knife (10) according to one of the preceding claims, characterized by that the groove (22) is designed such that the blade (16) can be inserted into the groove (22) with a cutting angle γ between 50° and 60°. [12] Meat grinder knife (10) according to one of the preceding claims, characterized by that a bevel formed on the blade (16) has a length between 4 mm and 5 mm. [13] Meat grinder knife (10) according to one of the preceding claims, characterized by that the thickness of the blade (16) is between 3.5 mm and 4.5 mm. [14] Meat grinder knife (10) according to one of the preceding claims, characterized by that the blade (16) is made of a hardenable and magnetizable knife steel. [15] Meat grinder knife (10) according to one of the preceding claims, characterized by that it is a meat grinder knife (10) designed for a smooth system. [16] Arrangement of a meat grinder knife (10) according to one of claims 1 to 15 in a meat grinder between a first perforated disc arranged on the inlet side and between a second perforated disc on the outlet side, such that the at least one blade (16) arranged on the inlet side and the at least one blade (16) on the outlet side are arranged at least partially adjacent to the perforated disc. [17] Arrangement according to the preceding claim, characterized by that the length and arrangement of the blade (16) are designed such that the blade (16) in the final assembly state extends completely over the cutting area which is predetermined on the first perforated disc and the second perforated disc by the arrangement of the through openings.

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