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

Abstract

The invention relates to a meat grinder blade (10) with a blade carrier (12) which has an entry side (E) and an exit side (A), wherein the blade carrier (12) has at least one blade wing (14) on the entry side (E) and on 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 side (18) and a blade back (20) opposite the cutting side (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). The blades (16) on the entry side (E) and on the exit side (A) are each mounted in a pivoting manner insofar as the blade back (20) and / or the groove base (24) is / are designed in an arc shape such that the blade back (20) can pivot and / or slide with a central section on the groove base (24).

Description

[0001] The invention relates to a meat grinder blade with interchangeable blades arranged on both sides, and to a blade assembly with such a blade in a meat grinder. Meat grinder blades are known in practice that have an inlet side and an outlet side, the conveying direction within a meat grinder being the direction in which the material to be ground is conveyed. The material to be ground, in particular fresh meat, is conveyed from the inlet side to the outlet side of the respective cutting element. The meat grinder blade relating to the invention has at least one blade on the inlet side and at least one blade on the outlet side, the blades being arranged to be interchangeable. Such interchangeably arranged blades are also referred to as replaceable 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 grinding fresh meat and / or other foodstuffs or substances.

[0002] From DE 625 914 A, a knife for meat grinders is known which has one or more replaceable, self-adjusting blade(s). The blades have a circular arc-shaped contour on their back side and are arranged such that they completely penetrate the knife carrier and protrude from it on both sides. A disadvantage is that the blades are insufficiently secured against falling out and can fall out when a cutting set is being installed. A further disadvantage is that the blades completely penetrate the knife carrier in the middle area and that, due to the way the blades are arranged, the force is applied at different points on the entry and exit sides of the knife – viewed in the radial direction – at the respective blade tips.

[0003] From DE 802 044 A, a meat grinder blade with replaceable blades is known, in which the blades are clamped in place by means of a spring-loaded clamping element inserted into the blade holder. These blades are secured by upper and lower lugs and each protrudes into the blade holder on one side. A disadvantage is the relatively complex assembly, in which the blades are first pushed under the upper lugs with one forked end, then pivoted, and finally the blades are pushed under the lower lugs with their opposite end. The shape of the blades is neither described nor shown.

[0004] The blade carriers of the meat grinder blades disclosed in DE 625 914 A and DE 802 044 A are each designed with three wings. The meat grinder blades disclosed in DE 625 914 A and DE 802 044 A from 1932 and 1949, respectively, did not gain practical acceptance.

[0005] From DE 10 2008 019 812 A1, a meat grinder knife of the applicant with inserted blades is known, in which the blades, with their cutting edges formed on them, are inserted only on one side into a groove formed in a blade wing. The blades are fixed on the side opposite the cutting edge by means of shaped elements. These shaped elements, together with negative shaped elements formed in the base of the groove, prevent displacement of the blade along the longitudinal axis of the groove or the longitudinal axis of the blade. 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, viewed in the conveying direction, as the first cutting element upstream of a first perforated disc.

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

[0007] A meat grinder blade according to the invention has a blade carrier with an entry side and an exit side. The blade carrier can be made in one piece or in multiple pieces. Preferably, the blade carrier is made in one piece and is manufactured as a casting. More preferably, the blade carrier has a circular support ring that connects the outer surfaces of the blade blades to each other in a circular arc. The blade carrier of a meat grinder blade according to the invention has at least one blade blade on both the entry side and the exit side. At least one blade is replaceably arranged in each of the at least one blade blade, wherein the blade has a cutting edge and a back opposite the cutting edge, and wherein a groove is formed in the blade blade for arranging the blade within the blade blade.Furthermore, the blades are mounted in a pivoting manner on both the entry and exit sides, insofar as the blade back and / or the groove base are curved such that the blade back – at least also – can pivot and / or slide on the groove base with a central section. During this pivoting motion, the blades move, in particular, about a virtual center point and pivot (oscillate) in the groove base.

[0008] In this context, "arc-shaped" does not necessarily mean circular arc-shaped. "Arc-shaped" also encompasses other curved contours that allow the blades to oscillate, adapting to the curvature of an adjacent perforated disc. Within the meat grinder, pressure typically builds up in the direction of travel, causing the perforated discs to deflect. The cutting result is better the more precisely the blades of a cutting element can move across the (ideally complete) surface of the adjacent perforated disc. By pivoting the blade, it can move into an optimal position during grinding, adjusting its position according to the deflection of the perforated disc to distribute the pressure evenly.The blades can also be described as pendulum blades. This results in even wear of the knife, particularly because it prevents the outer edge of the blade from wearing down more than the inner edge. Consequently, a high-quality cut is achieved along with a long service life.

[0009] If the groove base and / or the blade spine are shaped like a circular arc, radii of R20 to R150, preferably R40 to R100, and particularly preferably R49 to R84 have proven advantageous. Preferably, the radii at both the groove base and the blade spine are identical.

[0010] In another practical embodiment, identical 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 regularly changed to check 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 each has a recess. In this case, the blades inserted into the groove can have sharp edges and do not necessarily need to be deburred or chamfered.

[0012] If at least one blade has a predefined rotational range, it can be ensured that the blades are not inserted or mounted incorrectly. A predefined rotational range can be created, in particular, by means of a bolt and a corresponding opening, with one element being located on the blade and the other on the blade holder, especially in the area of ​​the groove of a blade wing. If the opening is a circular opening complementary to the bolt diameter, the rotational range is a pivot point. If the opening is a slotted hole, a rotational range remains that can also allow a certain degree of radial movement of the blade. This is the preferred variant because it allows for the compensation of manufacturing tolerances and further increases the blade's adjustment options relative to the perforated disc.This allows for longer service life and even better cutting results.

[0013] If at least one blade has a structurally defined range of motion for pivoting and / or sliding movement, it can be ensured that the radial movement is limited to a specific range. This can be achieved, in particular, by inner and outer stops within the groove. An outer support ring of the blade carrier can serve as an outer stop. A hub area of ​​the blade carrier can serve as an inner stop. Alternatively or additionally, corresponding stops can also be formed within the groove to limit the radial movement of the blade within the groove.

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

[0015] In another practical embodiment of a meat grinder blade according to the invention, the blades are magnetically, frictionally, and / or positively locked within the groove in such a way that they do not fall out when the meat grinder blade is installed in a meat grinder, but remain freely movable during the cutting process. This allows for easy installation while ensuring a high level of operational safety. Frictional locking can be achieved, in particular, by designing the thickness of the blades and the width of the groove as a transition fit. Optionally, additional securing measures can be provided, especially a wedge-shaped design of the groove in the depth direction and a correspondingly wedge-shaped design of the blade in the insertion direction.

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

[0017] Preferably, at least one groove on the entry side and at least one groove on the exit side are arranged at least partially in the same radial plane such that a web thickness of at least 3 mm remains between the grooves. This allows the material, and therefore the weight and manufacturing costs of a knife carrier, to be kept low, while simultaneously ensuring sufficient stiffness and strength of the knife carrier. The arrangement in the at least partially same radial plane has the advantage that the points of force application of the blades on the entry and exit sides – viewed radially – can be positioned close to each other. This results in a positive, low-moment load on the knife carrier. The web thickness is preferably between 3 mm and 4 mm.

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

[0019] In another practical embodiment, which also achieves particularly good cutting results, the blade and the groove are each matched to each other 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, especially those provided in addition to the above embodiments, also lead to particularly good cutting results. The groove is designed such that the blade can be inserted into it with a cutting angle γ between 50° and 60°. A chamfer formed on the blade has a length between 4 mm and 5 mm. The blade thickness is between 3.5 mm and 4.5 mm.

[0021] In another practical embodiment of a meat grinder blade according to the invention, the blade is made of a hardenable and magnetizable knife steel. This allows for a particularly simple and therefore preferred method of attaching the blade using one or more permanent magnets, which can be located in the area of ​​the blade holder, especially directly in the base of the groove 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, particularly for grinding harder objects.

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

[0023] Preferably, the meat grinder blade is designed to be used in a cutting set designed as a smooth system. This allows the meat grinder blade to be manufactured particularly easily and cost-effectively through machining.

[0024] The invention also relates to an arrangement of a meat grinder blade as described above in a meat grinder, such that it is positioned between a first, inlet-side perforated disc and a second, outlet-side perforated disc, such that the at least one inlet-side blade and the at least one outlet-side blade are at least partially in contact with the perforated disc. It has been shown that particularly high-quality cutting results can be achieved with such an arrangement, which, due to the specific arrangement of the blades mounted on both sides in a pivoting manner, exhibits 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, which is defined on the first and second perforated discs by the arrangement of the through-holes. Accordingly, only one blade needs to be arranged in a blade wing of a cutting set to operate the meat grinder in the known manner.

[0026] Further practical embodiments and advantages of the invention are described below in connection with the drawings. They show: Fig. 1 shows an exemplary embodiment of a meat grinder blade according to the invention in a view from the entry side, Fig. 2 shows the meat grinder blade in Figure 1 in a view according to arrow II in Fig. 1 Fig. 3 the meat grinder blade from the Figures 1 and 2In a view from the exit side opposite the entry side, Fig. 4, the meat grinder blade from the Figures 1 and 2 in a view according to arrow IV in Figure 1 , Fig. 5 a section through the knife carrier of the in the Figures 1 to 4 The meat grinder blade shown in Fig. 6 is a section through the blade carrier of the grinder in the area where the two blades are closest to each other. Figures 1 to 4 The meat grinder blade shown is in an off-center area, where one of the blades has a through-hole for positive locking by means of a bolt, Fig. 7den in Figure 4 Area marked VII in an enlarged view, Fig. 8 the meat grinder blade from the Figures 1 to 4 in an arrangement in front of a perforated disk with a view to the entry side of the knife, Fig. 9 the arrangement from Figure 8 in a side view, Fig. 10 an enlarged representation of the in Figure 9The area marked with X is rotated 90° clockwise to show the cutting angle, clearance angle, and wedge angle. Fig. 11 is an isometric view of the meat grinder blade from Figures 1 to 10. Fig. 12 is an isometric view of a section of the meat grinder blade. Figures 1 to 11 inserted blade with a view of the bevel and the blade tip, and Fig. 13 an isometric view of the blade made of Figure 12 with a view of the blade's spine.

[0027] In the Figures 1 to 4 and 11A meat grinder blade 10 is shown, which has a blade carrier 12. The meat grinder blade 10 and the blade carrier 12 have an entry side E and an exit side A, wherein the blade carrier 12 has four blade wings 14 on both the entry side E and the exit side A. In each blade wing 14, a blade 16 is arranged interchangeably on both the entry and exit sides. Each blade 16 has a cutting edge 18 and a blade back 20 opposite the cutting edge 18, wherein a groove 22 is formed in the blade wing 14 for the arrangement of the blade 16 in the blade wing 14.

[0028] As particularly in Figure 1As can be seen, the blades 16 on the entry side E and on the exit side A are each mounted in a pivoting manner insofar as the blade back 20 and a groove base 24 forming the bottom of the groove 22 are designed in an arc shape such that the blade back 20 with a central section can pivot and / or slide on the groove base 24.

[0029] The groove 22 with groove base 24 are clearly visible in the enlarged illustrations of Figures 5 and 6. This shows Figure 5 a section through a knife wing 14 in the area where two grooves 22 approach each other except for a small central ridge 26 with ridge thickness s. This is in the middle area of ​​the two blades 16, where the thickness of the blades 16, which are curved in an arc at the back 20 of the blade, is greatest.

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

[0031] Figure 6 Figure 1 shows another section plane, chosen such that it leads through a through-opening 28 formed in the blade 16 for the penetration of a bolt (not shown). A bolt opening 36 is also visible in this section plane, which serves to insert a bolt as a positive-locking securing element into the blade wing 14 and to penetrate the through-opening 28 of a blade 16 in its installed position. A screw (not shown) can serve as the bolt. Alternatively, a cylindrical bolt (not shown) can be inserted, in particular pressed in.

[0032] In the Figures 5 and 6It is clearly visible that the blades 16 each have a chamfer 30 leading to a blade tip 32. The blade tip 32 is formed by a linear region which has the greatest distance a to the nearest outer edge 34 of the knife wing 14.

[0033] In the Figures 5 and 6 It is clearly recognizable that the blade tips 32 of the blades 16 are arranged opposite each other on the entry side E and the exit side A, since the blades 16 are arranged in a mirror-symmetrical manner to the central axis M of the knife wing 14 - projected into a plane - in such a way that the chamfers 30 overlap at least partially.

[0034] In Figure 7 , which the in Figure 4 As shown in the enlarged representation of the area marked VII, it is easy to see that the blades 16 of opposing knife wings 14 - when projected onto a plane - are arranged in an overlapping manner.

[0035] The Figures 8 and 9 Figure 1 shows various views of an arrangement 40 consisting of a meat grinder blade 10 positioned 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 an annular section. A radially outwardly projecting material tab 44 is formed on the outer circumference of the perforated disc 38, serving as an anti-rotation device when inserted into a meat grinder housing (not shown). Alternatively, a recess or any other element can be provided as an anti-rotation device.

[0036] As from Figure 10 As can be clearly seen, the meat grinder blade 10 is arranged relative to the perforated disc 38 in such a way that the blade tip 32 of the respective chamfer 30 rests against the perforated disc 38.

[0037] In Figure 10 The clearance angle α, the wedge angle β and the cutting angle γ are also shown.

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

[0039] From the Figures 12 and 13The geometric design of the blades 16 is evident from an exemplary blade 16 shown in an isometric view. The blade 16 has two parallel longitudinal sides 48, 50, a chamfer 30 leading to a blade tip 32, and a blade spine 20, which here is circularly arc-shaped. The blade 16 also has a through-hole 28, which in the illustrated embodiment is designed as an elongated slot 52. The elongated slot 52 is designed to run parallel to the blade spine 20 such that the blade 16 can move radially along the meat grinder blade 10 and longitudinally along the groove 22. This results in an overall pivoting mounting of the blades 16, while simultaneously allowing the blade 16 to position itself within the groove in a pressure-optimized manner in the radial direction.

[0040] The features of the invention disclosed in this description, in the drawings, and in the claims can be essential for realizing the invention in its various embodiments, both individually and in any combination. The invention is not limited to the described embodiments. It can be varied within the scope of the claims and taking into account the knowledge of the person skilled in the art. Reference symbol list

[0041] 10 Meat grinder blade 12 Blade holder 14 Blade wing 16 Blade 18 Cutting edge 20 Blade back 22 Groove 24 Groove base 26 Web 28 Through opening 30 Chamfer 32 Blade tip 34 Outer edge 36 Bolt opening 38 Perforated plate 40 Arrangement 42 Through opening (in the perforated plate) 44 Material tab 46 Clearance 48 Longitudinal side 50 Longitudinal side 52 Slotted hole aDistance sWeb thickness AExit side EEntry side MCenter axis

Claims

1. Meat grinder blade (10) with a blade carrier (12) which has an entry side (E) and an exit side (A), wherein the blade carrier (12) has at least one blade wing (14) on the entry side (E) and on 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 side (18) and a blade back (20) opposite the cutting side (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 by that the blades (16) on the entry side (E) and on the exit side (A) are each mounted in a pivoting manner insofar as the blade back (20) and / or the groove base (24) is / are designed in an arc shape such that the blade back (20) can pivot and / or slide with a central section on the groove base (24).

2. Meat grinder blade (10) according to the preceding claim, characterized by the fact that Blades (16) with identical designs on both sides are used.

3. Meat grinder blade (10) according to one of the preceding claims, characterized by the fact that the corners in the groove base (24) have a clearance (46).

4. Meat grinder blade (10) according to one of the preceding claims, characterized by the fact that at least one blade (16) has a structurally defined rotation range or structurally defined range of motion for the pivoting movement.

5. Meat grinder blade (10) according to one of the preceding claims, characterized by the fact that The rotation range or range of movement 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 blade (10) according to one of the preceding claims, characterized by the fact thatthe blades (16) are magnetically, by frictional force and / or by positive locking 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 by pendulum motion during the cutting process.

7. Meat grinder blade (10) according to one of the preceding claims, characterized by the fact that the blades (16) are arranged to protrude 4 to 5 mm from an outer surface of the knife carrier (12).

8. Meat grinder blade (10) according to one of the preceding claims, characterized by the fact 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 section plane such that a web thickness of at least 3 mm remains between the grooves (22).

9. Meat grinder blade (10) according to one of the preceding claims, characterized by the fact thatthe blade (16) and the groove (22) are each aligned such that when the blade (16) is inserted into the groove (22), a chamfer (30) formed on the blade (16) has a clearance angle α between 5° and 15° relative to a plane perpendicular to the conveying direction.

10. Meat grinder blade (10) according to one of the preceding claims, characterized by the fact that the blade (16) and the groove (22) are each aligned such 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 blade (10) according to one of the preceding claims, characterized by the fact 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 blade (10) according to one of the preceding claims, characterized by the fact that a chamfer (30) formed on the blade (16) has a length between 4 mm and 5 mm and / or that the thickness of the blade (16) is between 3.5 mm and 4.5 mm and / or that the blade (16) is made of a hardenable and magnetizable knife steel.

13. Meat grinder blade (10) according to one of the preceding claims, characterized by the fact that it is a meat grinder blade (10) designed for a smooth system.

14. Arrangement of a meat grinder blade (10) according to one of claims 1 to 13 in a meat grinder such that between a first, inlet-side arranged perforated disc (38) and between a second, outlet-side perforated disc (38) such that the at least one inlet-side arranged blade (16) and the at least one outlet-side blade (16) are arranged at least partially in contact with the perforated disc (38).

15. Order according to the foregoing claim, characterized by the fact thatthe length and arrangement of the blade (16) are designed such that the blade (16) extends completely over the cutting area in the final assembly state, which is defined on the first perforated disc (38) and the second perforated disc (38) by the arrangement of the through-holes (42).

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