Blade and knife having a re-sharpenable serrated profile, and method for sharpening such a blade

Abstract

The present invention relates to a blade (1), in particular a knife blade, preferably for a kitchen knife, comprising a knife-edge (2) having a serrated cutting edge (3). In order to facilitate sharpening of this blade (1), according to the invention the serrated cutting edge (3) and a cutting flank (4) adjoining the cutting edge (3) on one of the two blade sides (1b) are exactly or substantially in a flank plane (FE) which is inclined with respect to a blade centre plane (ME), so that the serrated cutting edge (3) and the adjoining cutting flank (4) can be sharpened in a continuous movement along the knife-edge (2) by means of a sharpening device (6), in particular a rolling sharpener.

Description

[0001] Blade and knife with resharpenable wave profile and method for grinding such a blade

[0002] The present invention relates to a blade and a knife with a resharpenable wave profile and a method for grinding such a blade.

[0003] Blades and knives with a serrated edge are well-known from the state of the art. Bread knives with a serrated edge are among the items used in many households.

[0004] A significant disadvantage of such serrated blades and knives is that grinding and sharpening the serrations is extremely laborious. Typically, each individual serration must be worked on with a honing rod whose diameter is matched to the serration radius. This process is very time-consuming and arduous, and moreover, does not always produce satisfactory results, especially when performed by inexperienced users.

[0005] The present invention is based on the objective of facilitating the sharpening of blades and knives with a wave profile and, for this purpose, providing a blade and a knife with a resharpenable wave profile as well as a method for sharpening such a blade.

[0006] The problem is solved by the blade according to claim 1, the knife according to claim 14 and the method according to claim 15.

[0007] A blade, in particular a knife blade, preferably for a kitchen knife, is disclosed, comprising a cutting edge with a wavy cutting edge. The wavy cutting edge and a cutting flank adjacent to the cutting edge on one of the two sides of the blade lie exactly or substantially in a flank plane inclined to a blade center plane, so that the wavy cutting edge and the adjacent cutting flank can be ground in a continuous motion along the cutting edge using a grinding device (e.g., having a flat grinding surface), in particular a roller sharpener. The blade according to the invention enables the grinding / sharpening of the entire wavy profile in a continuous grinding motion and is therefore significantly easier and faster to process than conventional blades. The grinding process can, in particular, also be carried out by an inexperienced user.While sharpening conventional serrated blades requires a high degree of coordination in handling the blade and honing rod to resharpen each serration individually and at the required angle, positioning the blade according to the invention relative to the sharpening device is significantly simpler. For example, the blade only needs to be positioned at a constant angle to the sharpening device so that the sharpening surface of the device can be guided along the cutting edge to be sharpened and the adjacent cutting flank. The cutting flank can preferably serve as a support and guide surface for the sharpening device. Such a blade can be resharpened particularly easily using commercially available sharpening guides and roller sharpeners.

[0008] Beneficial further training courses are subject to dependent claims.

[0009] It can be advantageous for the flank plane to be inclined at an acute angle to the blade's central plane, preferably at an angle in the range of 12° to 25°, more preferably at an angle in the range of 14° to 22°, and particularly preferably at an angle of 15° or 20°. An angle of inclination of the flank plane to the blade's central plane in the relevant area enables a high degree of sharpness and stability of the cutting edge. Furthermore, material removal from the cutting edge or the adjacent cutting flank during grinding can be reduced. Due to the inclination of the flank plane to the blade's central plane, it is not necessary to machine the entire side of the blade. The cutting flank can thus be clearly separated from the adjacent blade surface. This means that little blade material needs to be removed to resharpen the cutting edges, thereby increasing the blade's service life.

[0010] It can be advantageous if the cutting flank extends continuously along the entire length of the cutting edge in the flank plane and preferably connects seamlessly to the cutting edge along its entire length. This allows for particularly gentle and uninterrupted grinding of the cutting edge and the adjacent cutting flank with minimal material removal. The cutting flank can then serve as a continuous guide surface for the grinding surface of the grinding tool.

[0011] It can be advantageous if the cutting edge has a preferably linear margin that abuts a blade side surface preferably aligned parallel to the blade's central plane, with the margin preferably extending parallel to an (imaginary) crest line of the wavy cutting edge. This margin physically separates the cutting edge to be machined from the adjacent blade side surface. This blade side surface is not to be machined and should therefore remain visually unaffected. A linear margin facilitates grinding the cutting edge in a continuous, linear motion without machining the adjacent blade side surface.

[0012] It can be advantageous if the cutting edge tapers towards the cutting edge in cross-section (perpendicular to the cutting edge and the blade's central plane) to form a chamfer, preferably wedge-shaped, preferably at an acute angle, and particularly preferably at an angle in the range of 30° (at the wave crest) to 60° (in the wave trough) (where this taper angle is most preferably smallest at the wave crests and largest in the wave troughs). This design improves the sharpness, as well as the sharpenability and stability of the cutting edge. It can be practical if the wavy cutting edge comprises concave cutting edge sections to form wave troughs and convex cutting edge sections to form wave crests projecting above the wave troughs, wherein preferably all concave cutting edge sections are identical and all convex cutting edge sections are identical.The convex cutting edge sections preferably form a serrated edge; this creates a sawing motion that is particularly useful for cutting through hard or tough materials, such as bread, tomatoes, or other foods with a hard outer layer and a soft interior. The convex cutting edge sections grip the food better, thus requiring less pressure. This prevents crushing or tearing of delicate foods. Preferred applications for such blades include knives for bread, tomatoes, citrus fruits, and other soft foods with a hard peel, as well as knives for certain craft tasks such as cutting rope.

[0013] It can prove helpful if the concave cutting edge sections are formed in a circular arc shape, wherein each concave cutting edge section preferably has a wave radius in the range of 0.1 mm to 2.5 mm and / or a wave depth in the range of 0.05 mm to 2.0 mm, wherein the wave radius is preferably constant in all concave cutting edge sections and is particularly preferably larger than the wave depth.

[0014] It can be advantageous if the convex cutting edge sections are tapered to a point, preferably forming a right or acute angle, wherein each convex cutting edge section preferably has a wave radius of no more than 0.1 mm, and the wave radius is particularly preferably constant in each convex cutting edge section. Such dimensions have proven to be particularly practical in tests.

[0015] It can be advantageous for the cutting edge to have concave and groove-shaped cutting flank sections, each extending individually from one of the concave cutting edge sections to the other of the two blade sides, preferably to form a wavy edge on the other of the two blade sides, which preferably runs parallel to the cutting edge. This design, among other things, improves the stability of the cutting edge and, in particular, the cutting edge. Furthermore, the concave and groove-shaped cutting flank sections are helpful for removing crumbs, liquids, or other substances from the cutting area when slicing a product.

[0016] It can be advantageous if the concave and groove-shaped cutting flank sections directly adjoin each other along the cutting edge, preferably forming linear cutting flank sections which preferably connect the wave crests of the cutting edge with the wave crests of the wavy rim, wherein the linear cutting flank sections are particularly preferably inclined relative to the blade's central plane, most preferably at the same angle as the flank plane. This design also improves the stability of the cutting edge and the cutting edge.

[0017] It can prove advantageous if the shape of each concave cutting flank section, as well as the adjacent cutting flank section, is obtained by intersecting a cylinder or cone with a wedge shape, wherein the lateral surface of the cylinder or cone penetrates the wedge shape starting from the wedge tip, and wherein, optionally, the central axis of the cylinder or cone is inclined at an acute angle to the wedge's central plane. Such a shape can be readily manufactured by machine.

[0018] It can be advantageous for the cutting edge height to be a maximum of 20%, preferably a maximum of 15%, and preferably a maximum of 10% of the blade height, where the blade height is measured from the crest of the wavy cutting edge to the spine of the blade, and the cutting edge height is measured from the crest of the wavy cutting edge to the edge adjacent to the side of the blade. The smaller the cutting edge, the less material needs to be removed to sharpen the blade. Therefore, reducing the cutting edge height can increase the blade's service life. The specified range of values ​​represents an optimum in terms of the sharpness, stability, and durability of the cutting edge.

[0019] It can prove advantageous if the height of the cutting edge is at least 10%, preferably at least 15%, and preferably at least 20% greater than the wave depth of the wave profile, wherein the wave depth of the wave profile is measured from the crest of the wavy cutting edge to the (deepest) trough, and the height of the cutting edge is measured from the crest of the wavy cutting edge to the edge adjacent to the blade's side surface. This design improves the grindability of the cutting edge. Ideally, this also leaves a narrow section of the cutting edge laterally next to the wave troughs, forming a continuous ridge on which a grinding surface of a grinding tool can be guided during the grinding process of the blade. This significantly improves the overall grindability of the cutting edge.

[0020] It can be advantageous if the cutting edge on the other of the two blade sides also has a wavy cutting edge, which, together with the adjacent cutting flank on this other blade side, lies exactly or substantially in a flank plane inclined relative to a blade center plane, so that the wavy cutting edge and the adjacent cutting flank on this other blade side can be ground with a grinding tool, in particular a roller sharpener, in a continuous motion along the cutting edge, the cutting edge preferably being symmetrical to the blade center plane. With this design, the cutting edge can ideally be reground and sharpened uniformly from both sides, which can further improve the blade's service life and cutting precision.

[0021] Another aspect of the invention relates to a knife, in particular a kitchen knife, comprising a handle and a blade according to one of the preceding embodiments. The knife offers the same advantages as the blade according to the invention.

[0022] Another aspect of the invention relates to a method for grinding a blade according to one of the preceding embodiments, comprising steps A, B and optionally C: a. Step A: Arranging the blade, preferably by means of a grinding guide, such that the flank plane is aligned perpendicular to a flat surface and the cutting edge points towards or away from the surface, wherein a crest line of the wavy cutting edge is preferably aligned parallel to the surface.

[0023] b. Step B: Grinding the wavy cutting edge and the adjacent cutting flank with a roller grinder, the end grinding surface of which rotates in a vertical plane when rolling on the flat surface, in a continuous rolling motion along the cutting edge, wherein step B is preferably repeated several times by moving the roller grinder back and forth along the cutting edge in opposite directions of movement with the grinding surface in contact with the cutting edge and the cutting flank, or by always moving the roller grinder along the cutting edge in the same direction of movement with the grinding surface in contact with the cutting edge and the cutting flank.

[0024] c. Step C: Polishing the wavy cutting edge and the adjacent cutting flank with the roller sharpener, the end-facing (and repelling from the grinding surface) polishing surface of which rotates in a vertical plane while rolling on the flat surface, in a continuous rolling motion along the cutting edge, wherein step C is preferably repeated several times by moving the roller sharpener back and forth along the cutting edge in opposite directions with the polishing surface in contact with the cutting edge and the cutting flank, or by always moving the roller sharpener along the cutting edge in the same direction with the polishing surface in contact with the cutting edge and the cutting flank.

[0025] An exemplary grinding guide is known, for example, from DE 102020 123500 A1. An exemplary roller grinder is disclosed, for example, in EP 3278928 B1. The grinding guide can, for example, have an approximately cuboid body and comprise at least one end-face contact surface which, in a state placed on the support, forms an acute angle with the support. The end-face contact surface can be covered by an elastic contact element. The blade is brought into planar contact with the elastic contact element with its front face and held magnetically in contact with the contact element, so that the flank plane is oriented perpendicular to the support when the grinding guide is placed on the support. The roller grinder can, for example, have a substantially cylindrical handle body which rotates between two rollers with end-face grinding surfaces that are rotatable relative to the handle body.The roller grinder is arranged with polishing surfaces. One of the end faces can be designed as a grinding surface, the other as a polishing surface. The user can grip the handle and roll it across the surface, so that the end faces, grinding and polishing surfaces, rotate in planes perpendicular to the surface.

[0026] Further advantageous developments of the invention result from combinations of the features disclosed in the claims, the description and the figures.

[0027] Brief description of the characters

[0028] They show:

[0029] Figure 1 shows different views of sections of the blade according to the invention from different sides, with view (a) showing a section of the blade front and view (b) showing a section of the blade back.

[0030] Figure 2 shows a perspective view of an arrangement comprising a flat base on which a blade according to the invention is positioned, the back of which is ground with a roller grinder rolling on the flat base, wherein the blade is oriented relative to the base such that the flank plane on the back of the blade is arranged perpendicular to the base or extends in a plane oriented perpendicular to the base, wherein the cutting edge of the blade is aligned parallel to the base and deflects away from the base.

[0031] Figure 3 shows the arrangement from Fig. 2 from a different perspective, looking at the back of the blade to be ground.

[0032] Figure 4 shows a detail of the blade according to the invention, including the cutting edge, cutting edge and cutting flanks, looking at the front of the blade.

[0033] Figure 5 shows a detail of the blade according to the invention, including the cutting edge, cutting edge and cutting flank, looking at the back of the blade.

[0034] Figure 6 shows an enlarged detail from Fig. 5.

[0035] Detailed description of the preferred embodiment

[0036] The preferred embodiment of the invention is described in detail below with reference to the accompanying figures. The subject matter of the invention is a blade 1, in particular a knife blade, such as that used, for example, in the kitchen for a bread knife. According to the invention, this blade 1 has a resharpenable serrated profile.

[0037] In views (a) and (b) of Figure 1, the blade 1 is shown looking at both blade sides 1a, 1b, with the cutting edge 2 and cutting edge 3 on top. While the blade 1 is identical or only slightly different on both blade sides 1a, 1b in the area of ​​the blade face and the tang (part of the blade 1 that projects into the handle of a knife), the cutting edge 2 of the blade 1 is shaped differently on the two blade sides 1a, 1b.

[0038] As shown in the figures, the blade 1 comprises a cutting edge 2 with a wavy cutting edge 3. The cutting edge 2 tapers wedge-shaped at an acute angle of approximately 30° to the cutting edge 3 in a cross-section perpendicular to both the cutting edge 3 and the blade's central plane ME, forming a chamfer. To create the resharpenable wavy profile, both the wavy cutting edge 3 and the cutting flank 4 adjacent to the cutting edge 3 on the back 1b of the blade lie in a flank plane FE inclined at an angle α of 15° to the blade's central plane ME. Because the wavy cutting edge 3 and the immediately adjacent cutting flank 4 lie in the same flank plane FE, they can be ground in a continuous motion along the cutting edge 2, particularly with a grinding tool 6 having a flat grinding surface, especially a roller sharpener.

[0039] The cutting flank 4 extends continuously along the entire length of the cutting edge 3 in the flank plane FE and connects seamlessly to the cutting edge 3 along its entire length. The cutting flank 4 forms a narrow rib as a guide surface on which a grinding surface of a grinding tool can be guided during grinding operations, thus enabling a continuous grinding movement along the entire shaft profile and allowing all shafts of the shaft profile to be machined in one pass.

[0040] The cutting flank 4 comprises a linear edge 4a, which extends parallel to an imaginary ridge line KL of the wavy cutting edge 3 and adjoins the blade side surface 1b, which is aligned parallel to the blade midplane ME.

[0041] The wavy cutting edge 3 comprises concave cutting edge sections 3a with a wave radius of, for example, 1.5 mm and a wave depth of, for example, 0.5 mm to form wave troughs, as well as convex, tapered cutting edge sections 3b with a wave radius of, for example,

[0042] 0.1 mm for the formation of wave crests projecting above the wave troughs, forming a right or acute angle β at the tip. The concave and convex cutting edge sections 3a, 3b are identical along the cutting edge 2.

[0043] Each of the following sections of the cutting edge, a concave and a groove-shaped cutting flank section 5b, extends from one of the concave cutting edge sections 3a to the blade face 1a, forming a wavy edge 5c that runs parallel to the cutting edge 3. The concave and groove-shaped cutting flank sections 5b abut each other along the cutting edge 2, forming linear cutting flank sections 5a. These linear cutting flank sections 5a are inclined to the blade's central plane ME, for example, at the same angle α of 15° as the flank plane FE, and each connects a wave crest 3b of the cutting edge 3 with a wave crest of the wavy edge 5c. This structure gives the cutting edge high stability.

[0044] The shape of each concave cutting flank section 5b and of the adjacent cutting flank section 3a is obtained by intersecting a cylinder with the wedge shape of the cutting edge 2, wherein the lateral surface of the cylinder penetrates the wedge shape starting from the wedge tip and wherein the central axis of the cylinder is inclined at an acute angle of e.g. 15° to the wedge central plane.

[0045] The height of the cutting flank 4, measured from the crest line KL of the wavy cutting edge 3 to the edge 4a adjacent to the blade side surface 1b, is a maximum of 10% of the blade height, measured from the crest line KL to the blade back, and is at least 20% greater than the wave depth of the wave profile, measured from the crest line KL to the wave base.

[0046] To form the knife according to the invention, only handle halves or scales need to be mounted on both sides of the tang of the blade according to the invention.

[0047] The method for grinding this blade 1 according to the preferred embodiment comprises steps A, B and optionally C:

[0048] Step A: Arrange the blade 1 using a grinding guide so that the flank plane FE is aligned perpendicular to a flat base U and the cutting edge 3 deflects away from the base U, with the crest line KL of the wavy cutting edge 3 being aligned parallel to the base U.

[0049] Ideally, a grinding gauge according to DE 102020 123500 A1 is used to carry out the method. This grinding gauge comprises an approximately cuboid body with end-face contact surfaces covered by elastic contact elements. One contact surface is designed for a grinding angle of 15° and the other for a grinding angle of 20°. The contact surfaces are marked accordingly. The blade 1 is brought into planar contact with the elastic contact element of the grinding gauge at the contact surface for the 15° grinding angle, with its front edge 1a in contact. The blade 1 is held magnetically against the contact element, so that the back edge 1b of the blade is deflected from the grinding gauge and is oriented at an acute angle of 75° to the base U.Step B: Grinding the wavy cutting edge 3 and the adjacent cutting flank 4 with a roller grinder 6, the end grinding surface of which rotates in a vertical plane when rolling on the flat surface U, in a continuous rolling motion along the cutting edge 2, wherein step B is repeated several times by moving the roller grinder 6 back and forth along the cutting edge 2 in opposite directions of movement B with the grinding surface in contact with the cutting edge 3 and the cutting flank 4, or by always moving the roller grinder 6 along the cutting edge 2 in the same direction of movement B with the grinding surface in contact with the cutting edge 3 and the cutting flank 4.

[0050] Ideally, a roller sharpener 6, such as that known from 3278928 B1, is used. The roller sharpener 6 comprises a cylindrical handle body arranged between two rollers that rotate relative to the handle body and have grinding or polishing surfaces on their ends. One of the circular ends of the roller sharpener is designed as a grinding surface, the other as a polishing surface. When the roller sharpener 6 is gripped by the handle body and rolled across the surface, the grinding or polishing surfaces rotate in planes perpendicular to the surface U.

[0051] Figure 3 schematically illustrates a state in which the roller sharpener 6, with its end-face grinding surface, is in contact with the cutting edge 3 and cutting flank 4. For the sake of simplicity, a grinding guide holding the blade 1 is not shown.

[0052] When the roller grinder 6 has reached the end of the cutting edge 2, it can either be moved back to the starting position along the cutting edge 2 in the opposite direction of movement B, or it can be removed from the cutting edge 2 and placed back at one end of the cutting edge 2 in the starting position to repeat the grinding operation in the same direction of movement B.

[0053] Step C: Polishing the wavy cutting edge 3 and the adjacent cutting flank 4 with the roller grinder 6, whose end-face polishing surface rotates in a vertical plane when rolling on the flat surface U, in a continuous rolling motion along the cutting edge 2, wherein step C is preferably repeated several times by moving the roller grinder 6 back and forth along the cutting edge 2 in opposite directions of movement B with the polishing surface in contact with the cutting edge 3 and the cutting flank 4, or by always moving the roller grinder 6 along the cutting edge 2 in the same direction of movement B with the polishing surface in contact with the cutting edge 3 and the cutting flank 4.

[0054] Starting from step B, the roller sharpener 6 simply needs to be rotated so that the polishing surface of the roller sharpener 6, which repels the grinding surface, points towards blade 1.

[0055] When the roller grinder 6 has reached the end of the cutting edge 2, it can either be moved back to the starting position along the cutting edge 2 in the opposite direction of movement B while polishing, or it can be removed from the cutting edge 2 and placed back at one end of the cutting edge 2 in the starting position to repeat the polishing operation in the same direction of movement B.

[0056] The main advantages of the claimed invention can be summarized as follows:

[0057] The new cutting edge geometry of the blade 1 according to the invention enables the serrated edge to be ground with the roller sharpener 6 in such a way that all cutting edge sections 3a, 3b which come into contact with the material being cut during cutting are touched by the grinding surface of the roller sharpener 6 and reground.

[0058] The front of the blade 1a is not resharpened with the roller sharpener 6. Only the back of the blade 1b is processed and resharpened with the roller sharpener 6 at a 15° angle. This is a standard sharpening angle that is preset on commercially available sharpening guides. Therefore, the blade 1 can be easily positioned at the correct angle to a flat surface U using commercially available sharpening guides.

[0059] The waves of the serrated edge profile are applied and sharpened during blade manufacturing using a special tool. Due to the geometric nature of the serrations, which originate from the front of the blade (1a), waves are also created on the back of the blade (1b). During knife production, a 15° bevel is ground onto the back of the blade (1b). The front of the blade (1a) is not subsequently sharpened with the roller sharpener (6) and can remain completely untreated. The back of the blade (1b), however, can be repeatedly sharpened at a 15° angle using the roller sharpener (6).

[0060] The burr formed on the cutting edge 3 during grinding is removed after grinding by honing the cutting edge 2 over a suitable material.

[0061] Using a grinding guide, e.g., according to DE 10 2020 123 500 A1, and a roller sharpener 6, e.g., according to 3278928 B1, a particularly simple grinding process of the blade 1 according to the invention is possible. However, these aids are not absolutely necessary for grinding the wavy cutting edge 2. Since the cutting edge 3 and the adjacent cutting flank 4 on the back of the blade 1b lie in the same flank plane FE, in principle any grinding device – in particular a grinding device with a flat grinding surface that can be laid flat on the flank plane FE and guided – can be used to sharpen the cutting edge 2.

[0062] The exemplary embodiment is to be understood merely as an illustration and not as a limitation. Various modifications of the claimed invention are possible within the scope of protection of the invention, which is defined by the appended claims. List of reference numerals

[0063] 1 blade

[0064] 1a Blade front

[0065] 1b Blade back

[0066] 2 cutting edges

[0067] 3 wavy cutting edges

[0068] 3a Concave cutting edge sections (wavy troughs)

[0069] 3b Convex cutting edge sections (wave crests / combs)

[0070] 4 Cutting edge (on the back of the blade)

[0071] 4a Edge of the cutting edge

[0072] 5 Cutting edge (on the front of the blade)

[0073] 5a Linear cutting flank sections (on the front of the blade)

[0074] 5b Concave groove-shaped cutting edge sections (on the front of the blade) 5c Wavy edge

[0075] 6 roller sharpeners

[0076] a Angle between flank / chamfer plane and middle plane

[0077] B Direction of movement

[0078] FE flank / chamfer plane

[0079] KL ridge line

[0080] ME Middle Level

[0081] U underlay

Claims

CHANGED REQUIREMENTS Received at the International Bureau on 18 August 2026 (18.08.2026) 1. Blade (1), in particular a knife blade, preferably for a kitchen knife, comprising a cutting edge (2) with a wavy cutting edge (3), characterized in that the wavy cutting edge (3) and a cutting flank (4) adjacent to the cutting edge (3) on one of the two blade sides (1b) lie exactly or substantially in a flank plane (FE) inclined relative to a blade central plane (ME), so that the wavy cutting edge (3) and the adjacent cutting flank (4) can be ground with a grinding device (6), in particular a roller sharpener, in a continuous movement along the cutting edge (2), characterized in that the flank plane (FE) is inclined at an acute angle (a) to the blade mid-plane (ME).

2. Blade (3) according to the preceding claim, characterized in that the flank plane (FE) is inclined relative to the blade center plane (ME) at an angle (a) in the range of 12° to 25°, preferably at an angle (a) in the range of 14° to 22°, particularly preferably at an angle (a) of 15° or 20°.

3. Blade (1) according to one of the preceding claims, characterized in that the cutting flank (4) extends continuously in the flank plane (FE) over the entire length of the cutting edge (3) and preferably connects seamlessly to the cutting edge (3) over the entire length of the cutting edge (3).

4. Blade (1) according to one of the preceding claims, characterized in that the cutting flank (4) has a preferably linear edge (4a) which adjoins a blade side surface (1b) preferably oriented parallel to the blade central plane (ME), wherein the edge (4a) preferably extends parallel to an (imaginary) crest line (KL) of the wavy cutting edge (3).

5. Blade (1) according to one of the preceding claims, characterized in that the cutting edge (2) tapers in cross-section towards the cutting edge (3) to form a chamfer, preferably wedge-shaped, preferably at an acute angle, and particularly preferably at an angle in the range of 30° to 60°.

6. Blade (1) according to one of the preceding claims, characterized in that the wavy cutting edge (3) has concave cutting edge sections (3a) for forming wave troughs and convex cutting edge sections (3b) for forming over the AMENDED SHEET (ARTICLE 19) comprises wave troughs and protruding wave crests, wherein preferably all concave cutting edge sections (3a) are identical and all convex cutting edge sections (3b) are identical.

7. Blade (1) according to the preceding claim, characterized in that the concave cutting edge sections (3a) are formed in a circular arc shape, wherein each concave cutting edge section (3a) preferably has a wave radius in the range of 0.1 mm to 2.5 mm and / or a wave depth in the range of 0.05 mm to 2.0 mm, wherein the wave radius is preferably constant in all concave cutting edge sections (3a) and is particularly preferably larger than the wave depth.

8. Blade (1) according to one of the two preceding claims, characterized in that the convex cutting edge sections (3b) are tapered to a point, preferably to form a right or acute angle (β), wherein preferably each convex cutting edge section (3b) has a wave radius of a maximum of 0.1 mm, wherein the wave radius is particularly preferably constant in all convex cutting edge sections (3b).

9. Blade (1) according to one of the three preceding claims, characterized in that the cutting edge (2) has concave and groove-shaped cutting flank sections (5b) extending from the concave cutting edge sections (3a) to the other of the two blade sides (1a), preferably to form a wavy edge (5c) on the other of the two blade sides (1a), which preferably runs parallel to the cutting edge (3).

10. Blade (3) according to the preceding claim, characterized in that the concave and groove-shaped cutting flank sections (5b) along the cutting edge (2) directly adjoin each other, preferably forming linear cutting flank sections (5a), which preferably connect the wave crests of the cutting edge (3) with the wave crests of the wavy edge (5c), wherein the linear cutting flank sections (5a) are particularly preferably inclined relative to the blade center plane (ME), most preferably at the same angle as the flank plane (FE).

11. Blade (1) according to one of the two preceding claims, characterized in that the shape of each concave cutting flank section (5b) and of the adjacent cutting flank section (3a) is obtained by intersecting a cylinder or cone with a wedge shape, wherein the lateral surface of the cylinder or cone penetrates the wedge shape starting from the wedge tip and wherein, if necessary, the AMENDED SHEET (ARTICLE 19) Central axis of the cylinder or cone is inclined at an acute angle to the wedge central plane.

12. Blade (1) according to one of the preceding claims, characterized in that the height of the cutting flank (4) is a maximum of 20%, preferably a maximum of 15%, preferably a maximum of 10% of the blade height, wherein the blade height is measured from the crest line (KL) of the wavy cutting edge (3) to the blade back and the height of the cutting flank (4) is measured from the crest line (KL) of the wavy cutting edge (3) to the edge (4a) adjacent to the blade side surface (1b).

13. Blade (1) according to one of the preceding claims, characterized in that the height of the cutting flank (4) is at least 10%, preferably at least 15%, preferably at least 20% greater than the wave depth of the wave profile, wherein the wave depth of the wave profile is measured from the crest line (KL) of the wavy cutting edge (3) to the (lowest) wave trough and the height of the cutting flank (4) is measured from the crest line (KL) of the wavy cutting edge (3) to the edge (4a) adjacent to the blade side surface (1b).

14. Blade according to one of the preceding claims, characterized in that the cutting edge (2) on the other of the two blade sides (1a) also has a wavy cutting edge (3) which lies exactly or substantially in a flank plane (FE) inclined relative to a blade central plane (ME) with the cutting flank (4) adjacent to this other blade side (1a), so that the wavy cutting edge (3) and the adjacent cutting flank (4) on this other blade side (1a) can be ground with a grinding device (6), in particular a roller grinder, in a continuous movement along the cutting edge (2), wherein the cutting edge (2) is preferably symmetrical to the blade central plane (ME).

15. Knife, in particular kitchen knife, comprising a handle and a blade (1) according to any of the preceding claims.

16. Method for grinding a blade (1) according to any one of the preceding claims, comprising steps A, B and optionally C: a. Step A: Arranging the blade (1), preferably by means of a grinding guide, such that the flank plane (FE) is aligned perpendicular to a flat base (U) and the cutting edge (3) points towards the base (U) or points away from the base (U), wherein a crest line (KL) of the wavy cutting edge (3) is preferably aligned parallel to the base (U). AMENDED SHEET (ARTICLE 19)b. Step B: Grinding the wavy cutting edge (3) and the adjacent cutting flank (4) with a roller grinder (6), the end grinding surface of which rotates in a vertical plane when rolling on the flat surface (U), in a continuous rolling motion along the cutting edge (2), wherein step B is preferably repeated several times by moving the roller grinder (6) back and forth along the cutting edge (2) in opposite directions of movement (B) with the grinding surface in contact with the cutting edge (3) and the cutting flank (4), or by always moving the roller grinder (6) along the cutting edge (2) in the same direction of movement (B) with the grinding surface in contact with the cutting edge (3) and the cutting flank (4). c. Step C: Polishing the wavy cutting edge (3) and the adjacent cutting flank (4) with the roller sharpener (6), the end-face polishing surface of which rotates in a vertical plane while rolling on the flat surface (U), in a continuous rolling motion along the cutting edge (2), wherein step C is preferably repeated several times by moving the roller sharpener (6) back and forth along the cutting edge (2) in opposite directions of movement (B) with the polishing surface in contact with the cutting edge (3) and the cutting flank (4), or by always moving the roller sharpener (6) along the cutting edge (2) in the same direction of movement (B) with the polishing surface in contact with the cutting edge (3) and the cutting flank (4). AMENDED SHEET (ARTICLE 19)

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