Magnetic sharpening jig comprising a flexible contact element

Abstract

The invention relates to a magnetic sharpening jig (1), in particular for holding, by magnetic force, a cutting tool (2) which is to be sharpened or polished and which includes a magnetizable blade (2a), and for positioning said cutting tool relative to a sharpening and / or polishing tool, e.g. a rolling sharpener (3). In order to provide a versatile magnetic sharpening jig (1), according to the inven- tion, the magnetic sharpening jig (1) includes at least one flexible contact element (4) with which the magnetically attracted blade (2a) of the cutting tool (2) comes into contact during normal op- eration. Also disclosed are a set comprising a magnetic sharpening jig (1) of said type and a rolling sharpener (3), as well as a method for sharpening or polishing the cutting tool (2) using said magnetic sharpening jig (1).

Description

CA 3192759 Magnetic Sharpening Jig Comprising a Flexible Contact Element THE FIELD OF THE INVENTION The present invention relates to a magnetic sharpening jig, in particular for holding, by magnetic force, a cutting tool with a magnetizable blade to be sharpened or polished and for positioning the same with respect to a sharpening and / or polishing tool such as a rolling sharpener. THE BACKGROUND OF THE INVENTION A generic magnetic sharpening jig is known from DE 20 2020 001 180 U1. A rolling sharpener is known, for example, from EP 3 278 928 A. The magnetic sharpening jig known from the prior art is adapted to specific blade dimensions and comprises two contact sides. Blades with a greater blade height are intended to contact one con- tact side of the magnetic sharpening jig and are supported backwards on the planar base so that the cutting edge of the cutting tool to be sharpened or polished projects beyond the upper side of the magnetic sharpening jig and is accessible for processing with the rolling sharpener. For blades with a lower blade height, a step is provided on the other contact side of the magnetic sharpening jig (Figs. 10 and 11 of DE 20 2020 001 180 U1), on which the blade back can rest so that the cutting edge projects beyond the top of the magnetic sharpening jig and is accessible for pro- cessing with the rolling sharpener. The step for supporting the blade on the rear side is necessary with this magnetic sharpening jig to ensure a secure hold on the magnetic sharpening jig even when high forces are applied to the blade during the sharpening or polishing process. THE SUMMARY OF THE INVENTION The underlying problem of the present invention is to provide a magnetic sharpening jig which can be used in a more versatile manner and with which blades of different sizes and geometries can be positioned reliably on the magnetic sharpening jig. In order to solve this problem, the present invention provides a magnetic sharpening jig. The mag- netic sharpening jig according to the invention serves in particular for holding a cutting tool to be sharpened or polished with a magnetizable blade by means of magnetic force and for positioning the same relative to a sharpening and / or polishing tool such as a rolling sharpener. According to the invention, the magnetic sharpening jig has at least one flexible contact element with which the magnetically attracted blade of the cutting tool comes into contact as intended. The main advantage of the present invention compared to the prior art is essentially that the flex- ible contact element significantly increases the static friction of the blade on the magnetic sharp- ening jig. The static friction of the blade on the magnetic sharpening jig is largely defined by the magnetic holding force and the static friction coefficient of the contact element. The flexible contact * . 1 element has a very high static friction coefficient with respect to the magnetizable blade, in partic- ular made of metal. The static friction coefficient of the flexible contact element compared to the magnetizable blade is usually significantly higher than that of the body of the magnetic sharpening jig, which is made of wood, plastic or metal, for example. Due to its flexibility, the contact element adapts ideally to the surface of the blade and, if necessary, ensures extensive contact with the blade while compensating for unevenness. This further improves the static friction between the contact element and the blade. Due to the flexible contact element, the blade of the cutting tool can be held on the magnetic sharpening jig by magnetic force alone, even without a rear side support or step. Even when force is applied to the blade with the sharpening and / or polishing tool in the course of the sharpening or polishing process, the blade remains fixed in the intended hold- ing position on the magnetic sharpening jig. The flexible contact element thus considerably im- proves the static friction and holding properties of the magnetic sharpening jig. Relative movement between the magnetic sharpening jig and the blade of the cutting tool is prevented by the flexible contact element. This prevents damage to the blade, such as scratches. In addition, the flexible contact element ensures damping of the impact when the blade of the cutting tool is magnetically attracted to a body of the magnetic sharpening jig. In this case, the flexible contact element en- sures a better contact noise and a better contact response to the body of the magnetic sharpening jig. It can be advantageous if the contact element is made of plastic, preferably an elastomer, prefer- ably a vulcanizate of natural rubber or silicone rubber (silicone). Silicone is an inexpensively avail- able material with excellent static friction and damping properties. For the present application, a contact element made of silicone proves to be optimal. However, the flexible contact element can also be, for example, a metal plate with rubber coating or vulcanized surface or a sprayed-on coating. It may prove useful if the contact element has a Shore A hardness in the range 1 to 90, preferably in the range 20 to 40. In principle, the static friction coefficient of the contact element increases with decreasing Shore A hardness. On the other hand, the load-bearing capacity and dimensional stability of the contact element increase with increasing Shore A hardness. A contact element with low Shore A hardness, for example in the range of 20 to 40, in particular in the range of 20 to 30, proves to be optimal for the purposes of the invention. The Shore A hardness is preferably meas- ured according to DIN EN ISO 868, DIN ISO 7619-1 and ASTM D2240-00. * • 7 It may prove helpful if the magnetic sharpening jig has a body on which the contact element is arranged, wherein preferably the body of the magnetic sharpening jig is partly or entirely made of wood and / or plastic and / or metal. It can be useful if the contact element has a higher flexibility than the body and / or a magnet of the magnetic sharpening jig. In this way, the contact element dampens a contact impact between the blade and the body and / or magnet of the magnetic sharpening jig. It can be useful for the magnetic sharpening jig to have at least one contact side on which the contact element is arranged, wherein the contact element covers the contact side in sections or covers the entire surface. In this way, unintentional contact of the blade with the body of the mag- netic sharpening jig can be prevented. In addition, the contact element can be colored and used as a decorative element on the body of the magnetic sharpening jig. It may prove practical if the magnetic sharpening jig has at least one magnet for generating the magnetic force, wherein the contact element covers one, several or all magnet(s) of the magnetic sharpening jig in sections or covers the entire surface (preferably such that the magnet is not visible). In this way, unintentional contact of the blade with the magnet can be prevented. It may be helpful if the contact element is configured to elastically deform under the action of the magnetically attracted cutting tool, preferably to form a negative shape for a portion of the blade of the cutting tool in contact with the contact element. In particular, this allows the magnetically attracted blade of the cutting tool to be pressed into the contact element under elastic deformation of the latter and thus to be held not only frictionally but also positively on the contact element if necessary. In particular, if the back of the magnetically sharpened blade runs across the contact element, the back of the blade can "dig" into the contact element. A step supporting the rear side of the blade can form below the back of the blade. In this way, the blade can be held securely with the magnetic sharpening jig according to the invention even when considerable force is applied by a sharpening or polishing tool. For this purpose, it is useful if the contact element projects from a planar contact side of a body of the magnetic sharpening jig so that the body of the magnetic sharpening jig does not interfere with elastic deformation of the contact element by the magneti- cally attracted blade. It may be preferred if the contact element is configured such that contact between the magnetically attracted cutting tool and a body of the magnetic sharpening jig and / or at least one magnet of the magnetic sharpening jig is partially or completely prevented. This prevents the magnetically at- tracted blade of the cutting tool from being scratched or otherwise damaged. ١. ) f It can be useful if the contact element has a planar contact surface for the blade of the cutting tool. This allows the blade to be positioned freely relative to the contact surface. It may prove useful if the contact element has at least one marking which preferably indicates the amount of a sharpening angle, wherein the marking is preferably formed as a recess in the contact surface of the contact element, wherein the marking is particularly preferably arranged centrally in the contact surface. The marking facilitates the operation of the magnetic sharpening jig for a user. Particularly in the case of a magnetic sharpening jig with several different contact sides, the mark- ing makes it easier for the user to find a contact side with a suitable sharpening angle. It may be useful if the magnetic sharpening jig comprises a plurality of contact elements, preferably arranged on different, preferably on contact sides of a body of the magnetic sharpening jig facing away from or opposite to each other, wherein the contact elements preferably include different acute angles with an installation plane of the magnetic sharpening jig. The sharpening angle, which is preferably measured between the surface of the contact element (or contact surface) and a plane aligned perpendicular to the base, is preferably in the range between 15° and 20°. The sharpening surface of a rolling sharpener is usually aligned in a plane perpendicular to the base. The angle between the contact surface of the contact element and the base is preferably in the range between 70° and 75°. Another aspect of the invention relates to a set comprising a magnetic sharpening jig according to one of the preceding embodiments and a rolling sharpener, preferably a rolling sharpener accord- ing to EP 3 278 928 A. Such a rolling sharpener is movable in a rolling manner over a base and has at least one end-face sharpening or polishing surface. Still another aspect of the invention relates to a method of sharpening or polishing a cutting tool using the magnetic sharpening jig according to one of the preceding embodiments, comprising the steps of: Step A: Arranging the magnetic sharpening jig on a base. Step B: Providing a cutting tool with a magnetizable blade and a cutting edge attached to it. Step C: Arranging the blade in the magnetic field of the magnetic sharpening jig so that the blade is magnetically attracted and comes into contact with the contact element, preferably over the entire surface. Ł 1 r _ Step D: Sharpening or polishing the cutting edge of the cutting tool with a sharpening and / or polishing tool, preferably a rolling sharpener. Step A preferably involves a horizontally aligned, planar base, e.g. a tabletop or kitchen counter- top. A cutting tool with magnetizable blade in the sense of step B is, for example, a conventional kitchen knife with stainless steel blade. In step C, the blade of the magnetizable blade is preferably aligned parallel to the contact surface, as shown in Fig. 6, preferably such that the blade back is facing the base and the blade edge is facing away from the base. If the blade is magnetically attracted by the magnetic sharpening jig in this state, then only the blade with the blade surface comes into contact with the contact element in a planar manner, ideally over the entire surface, so that the cutting edge is accessible for sharpening or polishing. The sharpening in step D is preferably, but not necessarily, performed with a rolling sharpener. A rolling sharpener with an end-face sharpening or polishing surface is moved horizontally in a rolling motion over the planar base and is held in contact with the cutting edge of the blade of the cutting tool with the sharpening or polishing surface aligned in a vertical plane. The movement direction of the rolling sharpener is approximately parallel to the extension direction of the blade. The sharpening angle is defined by the plane in which the blade is held in contact with the contact element and the vertical plane of the sharpening or polishing surface. A rolling sharpener is known, among other things, from EP 3 278 928 A. It can be advantageous if the blade is arranged in step C such that the blade is spaced apart from the base and / or the cutting edge is facing away from the base. This makes the blade easily ac- cessible for machining. The contact element of the magnetic sharpening jig preferably has at least one of the following features: The contact element is made of plastic, preferably an elastomer, preferably a vulcanizate of natural rubber or silicone rubber (silicone). The contact element has a Shore A hardness in the range of 1 to 90, preferably in the range of 20 to 40. _ The contact element has a compressive modulus of flexibility in the range of 0.1 to 30 MPa, preferably in the range of 0.2 to 10 MPa, more preferably in the range of 0.25 to 2 MPa. The contact element has a thickness in the range of 0.1 to 2 mm, preferably a thickness in the range of 0.2 to 1 mm, more preferably a thickness in the range of 0.3 to 0.5 mm. • r r - The contact element has at least one planar contact surface, preferably several planar contact surfaces, preferably with different contact angles. - The contact element has a planar mounting surface with which the contact element is at- tached to a body of the magnetic sharpening jig, wherein the mounting surface is preferably aligned parallel to the contact surface. _ The contact element is firmly connected, preferably bonded, to a body and / or a magnet of the magnetic sharpening jig. - The contact element is configured as a cuboid body. _ The contact element has a marking, which is preferably introduced into the contact surface as a recess. _ The contact element has a rectangular outline. _ The contact element covers a contact side of the body of the magnetic sharpening jig in sections or over the entire surface. _ The contact element covers or closes at least one magnet receiving opening in the body of the magnetic sharpening jig in sections or over the entire surface. _ The contact element has, preferably at the contact surface, a static friction coefficient with respect to steel, in particular stainless steel, of more than 0.2, preferably more than 0.4, preferably more than 0.6, particularly preferably more than 0.8. _ The contact element has a higher static friction coefficient than a body and / or magnet of the magnetic sharpening jig. _ The contact element is transparent, translucent or opaque. - The contact element is colored with pigments. _ The contact element has a bottom and / or embedded and / or top decoration. • The contact element has an anti-slip surface. The contact element is formed as a coating of a body and / or a magnet of the magnetic sharpening jig. - . 1 t. The contact element is molded onto a body and / or a magnet of the magnetic sharpening jig. A body of the magnetic sharpening jig preferably has at least one of the following features: - The body has a length in the range of 50 to 150 mm, preferably a length in the range of 80 to 120 mm. _ The body has a height in the range of 15 to 30 mm, preferably a height in the range of 20 to 25 mm. _ The body has a width in the range of 40 to 80 mm, preferably a width in the range of 50 to 60 mm. _ The body is made of wood and / or plastic and / or metal at least in sections. - The body has a trapezoidal cross-section in a first cross-sectional plane intersecting - preferably perpendicularly – the contact element, wherein the cross-section preferably ta- pers towards the lower side. - The body has a rectangular cross-section in a second cross-sectional plane not intersect- ing the contact element, wherein the second cross-sectional plane is preferably aligned perpendicular to the first cross-sectional plane. - The body has a rectangular outline in top view and / or bottom view. _ The body has, preferably in a contact side, at least one opening for receiving at least one magnet, wherein the opening is preferably cylindrical and is preferably worked into the body of the magnetic sharpening jig perpendicular to the contact side. _ The body has a larger upper side than lower side. _ The body tapers from the top to the bottom, preferably steadily. The body has exclusively planar sides. The body is more chamfered or rounded on at least one edge defining the top than on at least one edge defining the bottom. A magnet of the magnetic sharpening jig preferably has at least one of the following features: The magnet is a permanent magnet. - ` t c _ The magnet includes a cylindrical outer contour. _ The magnet is accurately fitted in a receptacle in the body of the magnetic sharpening jig. * The magnet comprises at least one planar end face. _ The magnet is flush with the body of the magnetic sharpening jig at the end face. - The magnet is partially covered or fully concealed by the contact element on the end face. - There are several, preferably identical magnets on each contact side of the magnetic sharpening jig. - The holding force of the magnet is preferably in the range of 0.1 to 10 kg, preferably in the range of 0.2 to 5 kg, particularly preferably in the range of 0.5 to 4 kg. An installation section of the magnetic sharpening jig preferably has at least one of the following features: _ The installation section comprises a head and a shaft projecting from the head. _ A shaft of the installation section comprises at least one circumferential retaining rib. - The installation section is configured as a plastic plug. - The shaft of the installation section comprises at least one holding section that can be fixed to the body of the magnetic sharpening jig. - The holding section is configured in the shape of a fir tree. The holding section has a sawtooth structure in cross-section. - The holding section is wedge-shaped. - The holding section tapers towards the end of the shaft facing away from the head. The flanks of the shaft are inclined at a smaller angle to the shaft axis in the insertion direction, i.e. to the end of the shaft facing away from the head, than in the opposite direc- tion. 4 . . A force to insert the shaft into a corresponding opening of the body is less than a force required to pull the shaft out of this opening again. -- The installation section is made of plastic, preferably an elastomer, preferably a vulcani- zate of natural rubber or silicone rubber (silicone). , - The installation section has a Shore A hardness in the range of 20 to 80 preferably in the range of 40 to 60. 4 Further preferred embodiments result from combinations of the features disclosed in the descrip- tion and the drawings. • • . * 7 t Brief Description of the Figures Fig. 1: shows a side view of a magnetic sharpening jig according to the first embodiment of the invention, wherein the concealed components are shown in dashed lines. Fig. 2: shows a top view of the magnetic sharpening jig of Figure 1. Fig. 3: shows a schematic view of an arrangement comprising a magnetic sharpening jig ac- cording to Figs. 1 and 2, a cutting tool to be sharpened or polished, and a sharpening and / or polishing tool in the form of a rolling sharpener, wherein the blade of the cutting tool is held magnetically in contact with the flexible contact element of the magnetic sharp- ening jig so that the back of the blade is at a distance from the base and the cutting edge of the cutting tool faces away from the base. Fig. 4: shows a side view of a magnetic sharpening jig according to the second embodiment of the invention, wherein the concealed components are shown in dashed lines. Fig. 5: shows a top view of the magnetic sharpening jig shown in Figure 4. Fig. 6: shows the arrangement according to Fig. 3 from a different perspective. Detailed Description of the Preferred Embodiments The magnetic sharpening jig 1 according to the invention serves for holding, by magnetic force, a cutting tool 2 to be sharpened or polished with a magnetizable blade 2a and for positioning the same relative to a sharpening and / or polishing tool such as a rolling sharpener 3. According to the invention, the magnetic sharpening jig 1 comprises at least one flexible contact element 4 with which the magnetically attracted blade 2a of the cutting tool 2 comes into contact as intended. The magnetic sharpening jig 1 is claimed independently of the cutting tool 2 and its blade 2a. Therefore, the description and the claims are based on the intended case of use of the magnetic sharpening jig 1, in which the blade of the cutting tool 2 contacts the contact element 4 in a planar manner, as is clearly shown in Figs. 3 and 6. In the intended case of use, ideally only the magnetically attracted blade 2a of the cutting tool 2 comes into contact with the contact element 4 over the surface or the entire surface, wherein any contact of the cutting tool 2 with a body 5 or magnet 6 of the magnetic sharpening jig 1 is omitted. The magnetic sharpening jig 1 is adapted in particular for positioning cutting tools 2 in the form of kitchen knives. Kitchen knives often have a stainless steel blade 2a with an approximately planar blade and a slightly curved, one-sided cutting edge 2b. However, it is possible in principle that, I t apart from kitchen knives, other cutting tools 2 can also be positioned with the magnetic sharpen- ing jig 1 according to the invention. The shape of the cutting tool 2 and the blade 2a are therefore not decisive. The advantage of the magnetic sharpening jig 1 according to the invention lies precisely in the fact that it can be used universally for different blade sizes and geometries. Preferred embodiments are explained below with reference to the Figures. First embodiment (Figures 1 to 3 and 6) The magnetic sharpening jig 1 according to the first embodiment of the invention is described below with reference to Figures 1 to 3 and 6. The magnetic sharpening jig 1 comprises an approximately cuboidal body 5, which has a trape- zoidal cross-section in a cross-sectional plane intersecting the contact element 4 perpendicularly (parallel to the blade plane or drawing surface) as shown in Figure 1. On the lower side of the body 5, flexible installation sections 7 are located in the corner regions in each case and are inserted in a frictional manner into corresponding openings on the lower side of the body 5. Each installation section 7 is configured as a plastic plug and comprises a head and a shaft projecting from the head with a fir-tree structure, wherein the individual holding ribs have a saw-tooth structure in cross-section. The holding ribs are wedge-shaped and taper towards the end of the shaft projecting from the head. The flanks of the shaft and the holding ribs attached to it are inclined in the insertion direction, i.e. towards the end of the shaft facing away from the head, at a smaller angle to the shaft axis than in the opposite direction. Accordingly, a force to insert the shaft into the corresponding opening of the body 5 is less than a force required to withdraw it again from this opening. The plastic plug is preferably made of silicone and preferably has a Shore A hardness in the range of 40 to 60. In a state in which the installation sections 7 are inserted into the cylindrical recesses on the lower side of the body 5 and are positioned there in a frictional manner, the slightly rounded heads of these installation sections 7 project beyond the lower side of the body 5 of the magnetic sharpen- ing jig 1 and define an installation plane E for setting up the magnetic sharpening jig 1 on a flat base U (see Figs. 3 and 6). The body 5 of the magnetic sharpening jig 1 is preferably made of untreated or varnished wood (e.g. oak, walnut, beech or spruce) and preferably has exclusively planar sides. The edges on the . 4 lower side of the body 5 are preferably more weakly chamfered or rounded than the other edges of the body 5. In the first embodiment, the body 5 of the magnetic sharpening jig 1 has a length L of approx. 82 mm (measured at the top), a height H of approx. 22 mm and a width B of approx. 56 mm. Including the installation sections 7, the height H1 of the magnetic sharpening jig 1 is approximately 25 mm. The side of the body 5 that faces the positioning plane E of the magnetic sharpening jig 1 and forms an acute angle (90°-α1) of, for example, 70° with it, forms the contact side 8 of the magnetic sharpening jig 1. The sharpening angle <semantics>α<annotation encoding="application / x-tex">\alpha< / annotation>< / semantics>1 formed on this side of the magnetic sharpening jig 1 is 20° and corresponds to the angle between the contact side 8 and a vertical sharpening plane S aligned perpendicular to the positioning plane E, in which the sharpening or polishing surface of a rolling sharpener 3 is located and moves. In this embodiment, the side of the body 5 opposite the contact side 8 is aligned parallel to the sharpening plane S. Two, preferably cylindrical, bores are made in the contact side 8 of the body 5, into which corre- spondingly shaped, cylindrical magnets 6 are inserted with a precise fit in order to be flush with the contact side 8 of the body 5 at the end face. The contact side 8 of the body 5 and the outward-facing end faces of the magnets 6 inserted in the bores are covered and bonded over their entire surface by an flexible silicone contact element 4 with a rectangular outline. The contact element 4 has a thickness in the range of, for example, 0.5 mm and a Shore A hardness of, for example, 30. On its side facing away from the body 5, the contact element 4 forms a planar contact surface for the blade 2a of the cutting tool 2, against which the blade can ideally abut over the entire surface without the cutting tool 2 coming into contact with the body 5 of the magnetic sharpening jig 1. Optionally, a marking for indicating the amount ("20°") of the respective contact angle α1 is provided on the contact surface of the contact element 4, e.g. it is worked into the center of the contact element 8 as a recess. Marking in the form of an imprint is also possible. To sharpen or polish a cutting tool 2 with the magnetic sharpening jig 1 according to the method of the invention, the magnetic sharpening jig 1 is placed with the installation sections 7 on a planar base U (step A). A provided cutting tool 2 with magnetizable blade 2a and cutting edge 2b, such as a kitchen knife with stainless steel blade (step B), is arranged with its magnetizable blade 2a in the magnetic field of the magnetic sharpening jig 1 as intended in such a way that the blade is aligned parallel to the contact surface of the contact element 4 and only the magnetically attracted blade 2a comes into (full) surface contact with the contact element 4. The cutting edge 2b faces * . ĭ . away from the base U and the blade 2a is spaced apart from the base U. The blade 2a is thus held in contact with the contact element 4 solely by the magnet force of the magnetic sharpening jig 1. The flexible contact element 4 is elastically deformed by the blade 2a under the influence of the magnetic force until a force equilibrium is reached between the flexible restoring force of the contact element 4 and the magnetic force of the magnetic sharpening jig 1 exerted on the blade 2a. With a correspondingly soft and flexible contact element 4, the magnetically attracted blade 2a presses into the contact element 4. If the back of the blade runs across the contact element 4, a step is formed on the rear side of the blade 2a due to the elastic deformation of the contact element 4, which makes it even more difficult for the blade 2a held in contact with the contact element 4 to move. In this state, the blade 2a of the cutting tool 2 is machined with the rolling sharpener 3 with at least one end-face sharpening or polishing surface. The rolling sharpener 3 rolls horizontally over the flat base U and is held in contact with the cutting edge 2b of the blade 2a of the cutting tool 2 with the grinding or polishing surface aligned in a vertical plane. The direc- tion of movement of the rolling sharpener 3 is approximately parallel to the extension direction of the blade. The sharpening angle α is defined by the plane of extension of the blade held in contact with the contact element 4 as intended and the vertical plane of the sharpening or polishing surface of the rolling sharpener 3. Second embodiment (Figures 4 and 5) In the second embodiment, described below with reference to Figures 4 and 5, the magnetic sharpening jig 1 includes features substantially identical to those in the first embodiment, with differences explained below: Deviating from the first embodiment, the magnetic sharpening jig 1 of the second embodiment comprises two different contact sides 8 on sides of the body 5 facing away from each other, each of which is fully covered with its own flexible contact element 4. The respective contact element 4 is exactly the same size as the contact side 8 of the body 5 of the magnetic sharpening jig 1 covered by it. A blade 2a of a cutting tool 2 attracted by magnetic force thus comes into contact exclusively with the respective contact element 4 and not, for example, with the body 5 of the magnetic sharpening jig 1 or even the magnets 6 arranged therein. The grinding angles α1, α2 are formed differently on the two contact sides 8 of the body 5. For example, the grinding angle <semantics>α1<annotation encoding="application / x-tex">\alpha 1< / annotation>< / semantics> is 20° and the grinding angle <semantics>α2<annotation encoding="application / x-tex">\alpha 2< / annotation>< / semantics> is 15°. In the second embodiment, the body 5 of the magnetic sharpening jig 1 has a length L of approx. 112 mm (measured at the top), a height H of approx. 22 mm and a width B of approx. 56 mm. Including the installation sections 7, the height H1 of the magnetic sharpening jig 1 is approxi- mately 25 mm. • ٠ i . List of Reference Signs . 1 magnetic sharpening jig 2 cutting tool (knife) 2a blade 2b cutting edge 3 rolling sharpener 4 contact element 5 body 6 magnet 7 installation section 8 contact side Ε installation plane S sharpening plane U base

Claims

<pat:ClaimStatement>We claim:< / pat:ClaimStatement> <pat:Claims com:id="claims"> <pat:Claim com:id="CLM-00001"> <pat:ClaimNumber>1< / pat:ClaimNumber> <pat:ClaimText>1. A magnetic sharpening jig (1) for holding, by magnetic force, a cutting tool (2) which is to be sharpened or polished and which includes a magnetizable blade (2a), and for positioning said cutting tool relative to a sharpening and / or polishing tool, wherein the magnetic sharpening jig (1) includes at least one flexible contact element (4) with which the magnetically attracted blade (2a) of the cutting tool (2) comes into contact as intended, wherein the magnetic sharpening jig (1) comprises a body (5) on which the contact element (4) is arranged, wherein one side of the body (5), which faces a positioning plane (E) of the magnetic sharpening jig (1) and encloses an acute angle (90°-α1) with the plane (E), forms a contact side (8) of the magnetic sharpening jig (1) on which the contact element (4) is arranged. 2 The magnetic sharpening jig (1) according to claim 1, characterized in that the contact element (4) is made of an elastomer. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00003"> <pat:ClaimNumber>3< / pat:ClaimNumber> <pat:ClaimText>3. The magnetic sharpening jig (1) according to claim 1 or claim 2, characterized in that the contact element (4) has a Shore A hardness in the range from 1 to 90. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00004"> <pat:ClaimNumber>4< / pat:ClaimNumber> <pat:ClaimText>4. The magnetic sharpening jig (1) according to any one of claims 1 to 3, characterized in that the body (5) of the magnetic sharpening jig (1) consists partly or entirely of one or more of wood, plastic and metal. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00005"> <pat:ClaimNumber>5< / pat:ClaimNumber> <pat:ClaimText>5. The magnetic sharpening jig (1) according to claim 4, characterized in that the contact element (4) has a higher flexibility than the body (5) and / or a magnet (6) of the magnetic sharpening jig (1). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00006"> <pat:ClaimNumber>6< / pat:ClaimNumber> <pat:ClaimText>6. The magnetic sharpening jig (1) according to any one of claims 1 to 5, characterized in that the contact element (4) covers the contact side (8) in sections or covers the entire surface. The magnetic sharpening jig (1) according to any one of claims 1 to 6, characterized in that the magnetic sharpening jig (1) comprises at least one magnet (6) for generating the magnetic force, wherein the contact element (4) covers one, several or all magnets (6) of the magnetic sharpening jig (1) in sections or covers the entire surface. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00008"> <pat:ClaimNumber>8< / pat:ClaimNumber> <pat:ClaimText>8. The magnetic sharpening jig (1) according to any one of claims 1 to 7, characterized in that the contact element (4) is configured to elastically deform by action of the magnetically attracted cutting tool (2) to form a negative shape for a portion of the blade (2a) of the cutting tool (2) being in contact with the contact element (4). 5 < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00009"> <pat:ClaimNumber>9< / pat:ClaimNumber> <pat:ClaimText>9. The magnetic sharpening jig (1) according to any one of claims 1 to 8, characterized in that the contact element (4) is configured such that contact between the magnetically attracted cutting tool (2) and a body (5) of the magnetic sharpening jig (1) and / or at least one magnet (6) of the magnetic sharpening jig (1) is partially or completely prevented. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00010"> <pat:ClaimNumber>10< / pat:ClaimNumber> <pat:ClaimText>10. The magnetic sharpening jig (1) according to any one of claims 1 to 9, characterized in that the contact element (4) has a planar contact surface for the blade (2a) of the cutting tool (2). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00011"> <pat:ClaimNumber>11< / pat:ClaimNumber> <pat:ClaimText>11. The magnetic sharpening jig (1) according to any one of claims 1 to 10, characterized in that the contact element (4) comprises at least one marking which indicates the amount of a sharpening angle (<semantics>α<annotation encoding="application / x-tex">\alpha< / annotation>< / semantics>1, <semantics>α<annotation encoding="application / x-tex">\alpha< / annotation>< / semantics>2). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00012"> <pat:ClaimNumber>12< / pat:ClaimNumber> <pat:ClaimText>12. The magnetic sharpening jig (1) according to any one of claims 1 to 11, characterized in that the magnetic sharpening jig (1) comprises several contact elements (4), which are arranged on different contact sides (8) of the body (5) of the magnetic sharpening jig (1) facing away from or opposite to each other, wherein the contact elements (4) with the positioning plane (E) of the magnetic sharpening jig (1) enclose different acute angles (α1, α2). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00013"> <pat:ClaimNumber>13< / pat:ClaimNumber> <pat:ClaimText>13. The magnetic sharpening jig (1) according to claim 2, characterized in that the contact element (4) is made of a vulcanizate of natural rubber or silicone rubber. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00014"> <pat:ClaimNumber>14< / pat:ClaimNumber> <pat:ClaimText>14. The magnetic sharpening jig (1) according to claim 2, characterized in that the marking is formed as a recess in the contact surface of the contact element (4). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00015"> <pat:ClaimNumber>15< / pat:ClaimNumber> <pat:ClaimText>15. A set comprising the magnetic sharpening jig (1) according to any one of claims 1 to 14 and a rolling sharpener (3). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00016"> <pat:ClaimNumber>16< / pat:ClaimNumber> <pat:ClaimText>16. A method for sharpening or polishing a cutting tool (2) using the magnetic sharpening jig. (1) according to any one of claims 1 to 14, comprising the steps: a. Step A: Arranging the magnetic sharpening jig (1) on a base (U), b. Step B: Providing the cutting tool (2) with a magnetizable blade (2a) and a cutting edge (2b) arranged thereon, c. Step C: Arranging the blade (2a) in the magnetic field of the magnetic sharpening jig (1) so that the blade (2a) is magnetically attracted and comes into contact with the contact element (4), and . . d. Step D: Sharpening or polishing the cutting edge (2b) of the cutting tool (2) with a sharpening and / or polishing tool. < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00017"> <pat:ClaimNumber>17< / pat:ClaimNumber> <pat:ClaimText>17. The method according to claim 16, characterized in that the blade (2a) is arranged in step C such that the blade (2a) is spaced apart from the base (U) and / or the cutting edge (2b) is facing away from the base (U). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00018"> <pat:ClaimNumber>18< / pat:ClaimNumber> <pat:ClaimText>18. The method according to claim 16 or claim 17, wherein in Step C, the blade (2a) is magnetically attracted and comes into contact over the entire surface with the contact element (4). < / pat:ClaimText> < / pat:Claim> <pat:Claim com:id="CLM-00019"> <pat:ClaimNumber>19< / pat:ClaimNumber> <pat:ClaimText>19. The method according to any one of claims 16 to 18, wherein Step D comprises sharpening or polishing the cutting edge (2b) of the cutting tool (2) with a sharpening and / or polishing tool with the rolling sharpener (3). 1 F. • • • < / pat:ClaimText> < / pat:Claim> < / pat:Claims>