Roller grinder and roller grinder set

Abstract

The invention relates to a roller grinder which has a handle, at the front end of which a circular rolling disc, with a machining disc attached thereto, is rotatably mounted relative to the handle, and at the rear end of which support rollers are mounted, it being possible to move the roller grinder back and forth on the surface of a preferably flat substrate (e.g. a table) with a friction element that peripherally borders the rolling disc, wherein the rotating machining disc can machine the cutting edge of a cutting tool, and the roller grinder has an integrated adjustment device using which it is possible to adjust the machining plane of the machining disc at an angle of inclination obliquely to the surface of the substrate, thereby making it possible to adjust the grinding angle for machining the cutting edge.

Description

[0001] Roller grinder and roller grinder set

[0002] The invention relates to a roller grinder. A roller grinder is a hand-operated grinding device for manually working the cutting edge of a cutting tool, in particular a knife, by means of a working surface formed on or attached to the roller grinder, which is designed for grinding, polishing, deburring, or honing the cutting edge. A preferred, but not exclusive, area of ​​application for a roller grinder is the grinding of household, kitchen, or chef's knives, i.e., knives intended for use in the home, in the kitchen, or for cooking. The invention further relates to a roller grinder set, comprising a roller grinder according to the invention and a grinding aid cooperating therewith or a processing disc intended for the latter.

[0003] Grinding devices for machining the cutting edge of a cutting tool by grinding, polishing, deburring, or honing are known in numerous variations from the prior art. In many cases, the user of a grinding device must hold the grinding device in one hand when machining the cutting edge of a cutting tool and the cutting tool to be machined with the grinding device in the other hand. When machining the cutting edge, the user then pulls the machining surface of the grinding device over the cutting edge of the cutting tool, or conversely, the cutting edge of the cutting tool over the machining surface of the grinding device.

[0004] When machining the cutting edge of a cutting tool, in order to achieve a good result, in particular good sharpness, it is important that a certain angle, desired or specified for the respective cutting tool, the so-called grinding angle, between the blade of the cutting tool and the machining surface is both precisely set and maintained as accurately as possible when machining the cutting edge. The grinding angle, together with the blade angle, determines the cutting edge angle, which (with cutting edges ground on both sides) is about twice as large as the grinding angle. Both conditions, i.e.Achieving a specific grinding angle and maintaining it during machining along the cutting edge are difficult to achieve if both the grinding device and the cutting tool are held and guided by the user purely by hand, virtually freely in the air, which is why a high level of skill, experience and practice on the part of the user is required.

[0005] For this reason, so-called roller grinders were proposed in the prior art. Such roller grinders have an elongated, straight, cylindrical bearing body extending in an axial longitudinal direction, in which a rotational axis is mounted which is rotatable about the axial longitudinal direction relative to the bearing body. A circular rolling disc is attached to each of the two longitudinal ends of the bearing body. The rolling discs have the same outer diameter and can each have a circumferential, friction-increasing friction element, for example an elastic ring, on their radial outer side which borders the rolling discs along their circumference. The radial outer diameter of the rolling discs or, when friction elements are used, the radial outer diameter of the friction elements is larger than the radial outer diameter of the bearing body, so that the rolling discs orthe friction elements protrude radially beyond the casing of the bearing body.

[0006] The rolling discs are each rotatably mounted in their radial center by means of the axis of rotation relative to the bearing body. On at least one of the rolling discs, a machining surface for machining the cutting edge of a cutting tool is formed on its axially outer side, i.e. axially away from the bearing body, end face. The machining surface can, for example, be a coating formed directly on the axial outer side of the rolling disc or a separate, circular machining disc which is attached to the axially outer end of the bearing body so as to be rotatable about the axis of rotation or is fastened to the axial outer side of the rolling disc, is rotatable together with the rolling disc, has the machining surface on its axial outer side and has a radial outer diameter which is smaller than the radial outer diameter of the rolling discs orwhen using a friction element is smaller than the radial outer diameter of the friction element. The two rolling discs or the friction elements carried by the rolling discs can roll with their circular outer edge on a flat surface when the user places the roller grinder with the two rolling discs or the friction elements on this surface and moves it back and forth on it. When the roller grinder is moved back and forth, the rolling discs rotate about the axis of rotation, namely anti-clockwise in one direction of movement of the roller grinder and clockwise in the other direction of movement of the roller grinder, whereby the processing surface which is connected to a rolling disc and mounted so as to be rotatable relative to the bearing body rotates with it, driven by the rolling disc.Thus, the machining surface rotates when the roller grinder is moved back and forth, so that a cutting edge of the cutting tool to be machined that is placed against the machining surface can be machined by the rotating machining surface.

[0007] A roller grinder designed according to this basic principle is known from GB 437 733 A. The sharpening device proposed therein has an axis which is rotatably mounted in a bearing body and the bearing body is connected to a handpiece which extends transversely to the axis of rotation. At one end of the axis of rotation there is fastened a sharpening disk which has a machining surface designed for sharpening on its axially outer end face. At the other end there is arranged a metal wheel which has the same diameter as the sharpening disk. The cutting tool to be sharpened is clamped between two foldable plates and the sharpening device is rolled back and forth on one of the plates, the rotating machining surface lying against the cutting edge of the cutting tool to be sharpened and thus sharpening the cutting edge.

[0008] US Pat. No. 6,168,509 B1 discloses a knife sharpener with a clamping device for holding the knife to be sharpened at an adjustable sharpening angle. During sharpening, the knife's cutting edge is directed vertically downward, and the sharpening device is large, bulky, and wobbly.

[0009] GB 140 918 A discloses a device for sharpening the knives of guillotine cutting machines. Such cutting machines have a knife which moves downwards in a falling ball manner and has a downward-facing blade. The known device for sharpening the knife comprises two disks with grinding wheels which are loosely mounted on stub axles which are mounted in an oscillating rod which forms one side of a frame. The oscillating rod is pivotally mounted in the ends of the frame and the opposite side is provided with a sliding edge. A screwed threaded rod is pivotally connected to the oscillating rod, the hook-shaped end of which engages in an eyelet or hole in the rod, the other end of the threaded rod being positioned in a slotted extension of the frame and enabling adjustment and locking by means of nuts. An arm which carries a handle is screwed onto the threaded rod.The grinding wheels are adjusted to the inclination adapted to the knife using the threaded rod and the nuts and the device is then moved along the knife in the longitudinal direction of the table using the handle, whereby the grinding wheels are rotated by the contact of the tires mounted on them with the table and their flat surfaces grind the blade of the knife.

[0010] This known device for grinding blades for guillotine cutting machines can only be used for grinding blades where the cutting edge of the cutting tool points vertically downwards during grinding. This is because grinding an upward-pointing cutting edge would cause the lower corners of the grinding wheels, facing the blade, to touch the table, preventing the grinding wheels from rotating, assuming such a grinding angle can even be adjusted using the threaded rod's adjustment range. Furthermore, this known grinding device, with a handle attached to the threaded rod, is not optimal for handling, and the frame with the grinding wheels cannot be optimally guided along the cutting edge on the table.

[0011] DE 20 2022 001 390 U1 discloses a non-adjustable roller grinder and an associated adjustable grinding aid. It also describes a quick-change system for the abrasive carrier, i.e., the working disc, which is magnetically secured.

[0012] Improved roller grinders are known from EP 3 278 928 A2 and DE 20 2020 001 180 U1. In these, the bearing body for the rotation axis is designed as an elongated, straight, cylindrical handle that can be grasped by a user with the fingers of one hand. The rolling discs each have a friction-increasing, elastic ring on their radial outer side to increase the friction between the radial outer side of the rolling disc and the surface of the base. A circular machining disc is arranged at each of the two longitudinal ends of the handle, which rests with its axial inner side on the axial outer side of a rolling disc and is mounted rotatably about the rotation axis or fastened to the axial outer side of a rolling disc. The two machining discs are of the same size. They have the same radial diameter and have on their axially outer side, i.e.each have a processing surface on their end faces facing away from the handle. Furthermore, the two processing discs are rotatably mounted in the handle so that they can rotate relative to the handle when the handle is moved back and forth with the elastic rings resting on the base, without themselves rotating. The two processing discs therefore rotate when the roller grinder is moved back and forth, and a cutting edge of the cutting tool to be machined can be placed against the processing surface of one of the two processing discs and processed by the rotating processing surface. The roller grinder according to DE 20 2020 001 180 U1 has the special feature that the processing discs can rotate independently of one another. In the further development according to DE 10 2020 203 144 A1, the roller grinder has a transmission gear by means of which the processing disc rotates faster than the rolling disc.

[0013] In these roller grinders, the working surfaces of the two working wheels can be different from one another. For example, they can be designed as grinding surfaces with different grinding media (e.g. diamond, ceramic, corundum) and / or different abrasive grits, or the working surface of one working wheel can be designed as a grinding surface and the working surface of the other working wheel as a smooth, possibly recessed, honing or polishing surface. Furthermore, it is provided that the working wheels are detachably connected to the handle or to the rolling wheels, i.e. are interchangeable. For this purpose, for example, they have a centrally arranged, axially projecting threaded pin on their surface facing axially inwards, i.e. towards the handle, with which they can be screwed into an axial internal thread in the handle.

[0014] Such a roller grinder known from the prior art comprises two rollers (the rolling wheels) with frontal grinding and polishing surfaces (working surfaces) and a handle body arranged between the rollers. During its intended use, the roller grinder is pulled or pushed over a preferably flat, preferably horizontal, base by exerting force on the handle body, so that the frontal working surfaces rotate in a plane oriented perpendicular to the base of the roller grinder. This plane oriented perpendicular to the base is referred to as the working plane in the context of the present invention.

[0015] In order to set a specific grinding angle and maintain it when machining the cutting tool with such roller grinders, they are used in combination with a grinding aid that holds the cutting tool to be machined on the base on which the roller grinder is moved back and forth, in a defined, fixed position with the specified grinding angle relative to the rotating machining disk resting on the cutting edge. Such a grinding aid thus serves both as a grinding gauge for setting the grinding angle and as a grinding holder for securing the cutting tool during machining with the roller grinder and is also simply referred to as a grinding gauge in the prior art.

[0016] Such grinding aids are known from DE 20 2020 001 180 U1 and WO 2022 053 477 A1. They are designed as a grinding aid arranged on a flat base, with which the cutting tool to be machined can be held in a defined orientation so that a machining surface of a roller grinder rolling back and forth on this base and resting against the cutting edge of the cutting tool can machine the cutting edge.This grinding aid forms a flat, essentially cuboid-shaped body which has a flat underside and a top side which is spaced apart from the underside and is longer than the underside, and which has at least one inclined narrow side which is inclined between the underside and the top side, wherein the narrow side is inclined relative to the underside by a positioning angle which is greater than 90° and the deviation from 90° corresponds to the desired grinding angle, and behind the inclined narrow side within the body permanent magnets are arranged which magnetically hold a cutting tool made of steel which is placed against the inclined narrow side. The inclined narrow side serves as a contact surface for the blade of a cutting tool to be machined.As a rule, such grinding aids have two slanted, opposite narrow sides, with the positioning angle deviation from 90° being 15° on one narrow side and 20° on the other. The resulting option of working on the cutting edge of a cutting tool, especially a knife, with a grinding angle of only 15° or 20° is sufficient for most common kitchen knives. Other cutting tools, such as pocket knives, hunting knives, or outdoor knives, however, require larger grinding angles of approximately 25°, and filleting knives have grinding angles smaller than 15°. A filleting knife has a smaller grinding angle because the cutting work it is intended for requires an extremely thin cutting edge (high sharpness). The stability of the cutting edge is thus deliberately reduced in order to improve sharpness. The opposite is true for pocket or outdoor knives.A larger cutting angle is required here. This makes the cutting edge wider and more stable and durable, appropriate for the intended use.

[0017] In practice, specifying only one or two fixed grinding angles using a grinding aid for a roller grinder results in the user of the grinding aid sharpening the knife using the closest available grinding angle. However, this requires considerable grinding effort because a relatively large amount of steel must be ground away from the blade when a cutting edge is reground to a different cutting edge angle. Furthermore, this not only causes unnecessary wear to the cutting edge, but also changes the cutting edge angle specified by the cutting tool manufacturer, thereby limiting the knife's intended performance. To compensate for this disadvantage, WO 2022 053 518 A1 proposes a grinding aid in which the grinding angle can be adjusted to allow for greater versatility of the grinding aid.To do this, the inclination of the grinding aid against its base is changed using an actuating device or adjusting element. In practice, such designs have not yet proven successful due to their complex structure and laborious handling.

[0018] Within the scope of the invention, it has also been discovered that errors repeatedly occur when machining the cutting edge of a cutting tool with a roller grinder and a known grinding aid if the user is inattentive and accidentally places the cutting tool against a contact surface of the grinding aid that has an incorrect positioning angle while machining the cutting edge. It is suspected that this incorrect handling is facilitated by the fact that during machining, the blade of the cutting tool in the grinding aid is not held in a plane perpendicular to the support, but rather is inclined to it at the grinding angle.

[0019] Based on this prior art, the present invention seeks to create a roller grinder that is easier to handle and more reliable for use with different grinding angles. This object is achieved according to the invention by a roller grinder having the features of patent claim 1, by a roller grinder set comprising a roller grinder according to the invention and a grinding aid having the features of patent claim 15, and by a roller grinder set comprising a roller grinder according to the invention and a processing wheel having the features of patent claim 16. Embodiments, developments, and uses of the invention emerge from the dependent claims and the following description with associated drawings.

[0020] The roller grinder according to the invention for manually machining the cutting edge of a cutting tool, in particular a knife, by means of a machining surface fastened to the roller grinder, which is designed for grinding, polishing, deburring or honing the cutting edge, comprising a bearing body extending in an axial longitudinal direction, in which a rotational axis rotatable relative to the bearing body about its axial longitudinal direction is arranged, wherein the bearing body is designed as a handle which can be grasped by a user of the roller grinder with the fingers of one hand, a circular rolling disc attached to a front longitudinal end of the handle, a circular rolling disc attached to a front longitudinal end of the handle, which is mounted rotatably about the rotational axis relative to the handle, wherein the rolling disc has a circumferential,the rolling disc has a friction element surrounding its circumference, the radial outer diameter of which is larger than the radial outer diameter of the area of ​​the handle that borders the rolling disc in the axial direction, so that the friction element protrudes radially beyond the rolling disc and the handle at the front longitudinal end of the roller grinder, and a circular machining disc, which is attached to the axial outer side of the rolling disc at the front longitudinal end of the roller grinder, axially on the outside, i.e. pointing axially away from the handle, so as to be rotatable about the axis of rotation, and is rotatable together with the rolling disc, and on whose axially outer side, i.e. pointing axially away from the handle, the machining surface for machining the cutting edge of a cutting tool is formed, wherein the machining disc has a radial outer diameter that is smaller than the radial outer diameter of the friction element,has the special feature that the roller grinder has at least two rotatable support rollers in the area of ​​the rear longitudinal end of the handle facing away from the rolling disc, wherein the support rollers, whose roller rotation axes or roller bearings are arranged at a distance from the axis of rotation, and has an adjustment device integrated into the roller grinder, by means of which the angle of inclination of the axis of rotation of the roller grinder against a base, on which the roller grinder rests with the friction element and the support rollers during its intended use, can be adjusted to at least one value different from zero, wherein the distance of the support rollers from the axis of rotation is greater than the distance of the radial outer diameter of the friction element from the axis of rotation, so that the distance of the axis of rotation running obliquely to the base from the base is smaller at the front longitudinal end than at the rear longitudinal end.

[0021] To summarize the essence of the invention in a simplified manner, the roller grinder according to the invention has a handle on which a circular rolling disc, which is mounted so as to be rotatable relative to the handle and has a processing disc attached to it, and support rollers are arranged at the rear end. The grinder can be moved back and forth on the surface of a preferably flat base (e.g. a table) with a friction element surrounding the circumference of the rolling disc and the support rollers, whereby the rotating processing disc can process the cutting edge of a cutting tool, and has an integrated adjusting device with which the processing plane of the processing disc can be adjusted at an angle of inclination oblique to the surface of the base and thus the grinding angle for processing the cutting edge.

[0022] The invention is based on the knowledge that it is not necessary for the rotation axis, around which the roller grinder is rotated back and forth and which lies in the direction of the normal to the machining disk rotating at the same time, to be in the same direction as in all roller grinders known in the prior art due to the identical outer diameters of the two rolling disks or .Friction elements must be aligned parallel to the surface of the base and the grinding angle is only adjusted by means of the grinding aid used, but instead it is advantageous to set the axis of rotation at an angle to the base using an adjusting device, so that when used as intended, the roller grinder is pulled or pushed over a preferably flat, preferably horizontal base by exerting force on the handle, wherein the front processing surface rotates in a processing plane which is not perpendicular to the base of the roller grinder, but is inclined by this angle of inclination, i.e. the normal to the rotating processing disk is aligned at the angle of inclination oblique to the base. The invention therefore has the advantage that the grinding angle can be easily adjusted.

[0023] A rotation axis in the sense of the invention can be a straight line that describes a physically real rotation or rotation about such an axis of rotation, or a physical, elongated machine element that serves as an inner pivot bearing part for a rotatable part mounted by the axis.

[0024] A roller grinder according to the invention is suitable, designed and provided for machining the cutting edge of a cutting tool which points vertically upwards during machining. When machining the cutting edge, the cutting tool is held in a vertically upwards position by means of a grinding aid. The cutting edge is located directly above the horizontal base on which the roller grinder is placed for machining the cutting edge and is moved back and forth with a rotating machining surface resting against the cutting edge, and runs approximately parallel to the base. Since the distance of the radial outer diameter of the friction element from the axis of rotation, i.e. the distance of the contact point of the friction element on the base to the axis of rotation, is smaller than the distance of the support rollers from the axis of rotation, i.e.the distance of the contact points of the support rollers on the base to the axis of rotation is , the axis of rotation runs at an angle to the base, namely in such a way that the distance of the axis of rotation running at an angle to the base is smaller at the front longitudinal end than at the rear longitudinal end. The axis of rotation is therefore inclined towards the base (downwards) as seen from the rear longitudinal end to the front longitudinal end of the roller grinder, as a result of which the processing surface is tilted into a position adapted to the cutting edge or its grinding angle. A roller grinder according to the invention has the following further differences compared to the conventional roller grinders known from the prior art. Firstly, a rolling disc is only arranged at one longitudinal end of the handle.An inclined position of the rotation axis could indeed also be achieved with two rolling discs arranged at opposite longitudinal ends of the handle, provided these have different outer diameters, but with such a device only small angles of inclination could be achieved and it would be unwieldy and not adjustable to different angles of inclination. A further difference is that a roller grinder according to the invention has only one processing disc and not two. In practical use, however, this is not a significant disadvantage, particularly if a further design provides a quick and simple option for exchanging the processing discs.With respect to a radial center plane, the two halves of the roller grinder according to the invention are therefore not essentially identical in design and arranged as a mirror image of each other, but are very differently designed and not arranged as a mirror image of each other.

[0025] Otherwise, the mode of operation of the roller grinder according to the invention corresponds to that of conventional roller grinders known from the prior art. The rolling disc or the friction element carried by the rolling disc can roll with the circular outer edge on a flat surface if the user places the roller grinder with the friction element and the support rollers on this surface and moves it back and forth on it. When the roller grinder is moved back and forth, the rolling disc rotates about the axis of rotation, namely anti-clockwise in one direction of movement of the roller grinder and clockwise in the other direction of movement of the roller grinder, whereby the processing disc which is connected to the rolling disc and mounted so as to be rotatable relative to the handle rotates with the processing surface driven by the rolling disc.

[0026] The processing surface therefore rotates when the roller grinder is moved back and forth on the base so that a cutting edge of the cutting tool to be machined with the roller grinder that is in contact with the processing surface can be machined by the rotating processing surface. The processing disc is rotatably mounted in the handle so that it can rotate relative to the handle when the handle is moved back and forth on the base with the friction element and the support rollers, without itself rotating in the process. The processing disc therefore rotates when the roller grinder is moved back and forth and a cutting edge of the cutting tool to be machined can be placed against the processing surface of the processing disc and machined by the rotating processing surface. The grinding movement of the roller grinder is guided safely on the base by the friction element and the support rollers.

[0027] The fact that the axis of rotation is inclined to the base gives the tip of a knife an advantage over known roller grinders. In this area the roller grinder does not have to be guided in a straight line because the cutting edge tapers to a point, but rather along a path that is slightly curved towards the tip in order to grind the downward-sloping cutting edge all the way to the tip. In comparison to a known roller grinder, the roller grinder according to the invention requires less curved travel due to the inclined position of its axis of rotation and the processing wheel, and this requires less manual dexterity and precision.

[0028] In order to achieve a high level of stability, it can be advantageous if the bearing body designed as a handle, in which a rotation axis which is rotatable relative to the bearing body about its axial longitudinal direction is arranged, is completely or predominantly solid, with the exception of the openings, bores and depressions in the bearing body required for receiving, holding and supporting the other elements of the roller grinder.

[0029] The handle is preferably not cylindrical, but ergonomically shaped so that it can be easily and securely gripped and guided by the user's hand. This can be a shape, for example, whose surface is adapted to the inside of a slightly curved hand, or a concave shape in which the diameter of the handle is smaller in the area of ​​its axial center than at its longitudinal ends. This makes it possible to ensure that the handle has such a small diameter, particularly in the area of ​​its axial center, that it can be easily gripped by hand, but that there is still sufficient space in the handle near the rear longitudinal end to accommodate the adjustment device.

[0030] In principle, the support rollers could also be replaced by skids, sliding edges or sliding elements, but in order for the roller grinder to be guided and rolled easily and precisely on the base during use, in particular along a slightly curved path, which can be useful, for example, when machining the tip of a knife, it is advantageous if the support points of the roller grinder on the base are designed as rotatable support rollers. For the same reason, according to a further advantageous feature, it is proposed that the distance between the planes in which the at least two support rollers rotate is less than 2 cm, preferably less than 1 cm and particularly preferably less than 0.5 cm. In preferred embodiments, they rotate in the same plane.

[0031] The friction element arranged on the radial outer side of the rolling disc can preferably be a completely closed ring made of an elastic material which rests on the rolling disc and extends around the entire circumference of the disc. Such a ring can be inserted into a circumferential groove cut out on the casing of the rolling disc in such a way that at least part of the ring cross section projects radially beyond the rolling disc. Typical ring materials include rubber, natural rubber and soft to semi-hard synthetic elastomers, for example made from a vulcanizate of natural rubber or silicone rubber (silicone). The friction element can also be a coating sprayed or vulcanized onto the radial outer side of the rolling discs, for example.A friction element increases the friction between the outer surface of the rolling disc and the surface of the base and ensures that the rolling disc is reliably set in rotation when the roller grinder is pushed back and forth on the flat base. According to advantageous embodiments, the angle of inclination of the rotation axis can be continuously or gradually adjusted between different positions to improve user-friendliness or the range of applications. With stepwise adjustment, the angle of inclination can preferably be adjusted in steps of 0.5°, 1°, 2°, or 2.5°.

[0032] The adjustment device of the roller grinder can advantageously be designed such that the angle of inclination of the rotation axis can be locked in various adjustable positions, for example, magnetically and / or force-locking and / or form-locking, preferably with a latching mechanism. This ensures that the angle of inclination does not change when machining a cutting edge, allowing the roller grinder to be used easily and safely.

[0033] According to a further advantageous feature, it is proposed that the angle of inclination of the rotation axis is adjustable to values ​​between 0° and 30° and / or to values ​​between 0° and 10° and / or to values ​​between 10° and 30°. The roller grinder according to the invention can be used with a grinding aid according to the prior art, in which the cutting tool to be machined with the roller grinder is placed against a narrow side which is inclined towards the underside at a positioning angle greater than 90°. In this case, the grinding angle is roughly predetermined by the grinding aid, for example 10° or 15°, and can be finely adjusted, i.e. increased, using the adjustment device of the roller grinder. In this case, an adjustability of the roller grinder to values ​​between 0° and 10° can be sufficient, so that in the examples mentioned, a total grinding angle range resulting from the sum of the angles is between 10° and 20° oris adjustable between 15° and 25°. Advantageous embodiments may consist in that the angle of inclination of the rotation axis is adjustable to a minimum value that is greater than or equal to 0°, 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9° or 10°, and / or to a maximum value that is less than or equal to 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29° or 30°.

[0034] The roller grinder according to the invention can, however, also preferably be used with a grinding aid modified from the prior art, in which the cutting tool to be machined with the roller grinder is placed against a narrow side that is inclined relative to the underside at a positioning angle of 90°, i.e., the blade of the cutting tool to be machined is aligned perpendicular to the base. In this case, the grinding angle is determined by the roller grinder and can be set using the adjustment device of the roller grinder, whereby its adjustability to values ​​between 10° and 30° may be sufficient, so that this grinding angle range is adjustable. If the inclination angle of the rotation axis is adjustable to values ​​between 0° and 30°, the roller grinder can be used in both ways or with the widest application range.

[0035] A first advantageous development of a roller grinder can consist in that the support rollers are arranged at a fixed distance from one another, based on the distance between the axes of rotation of the support rollers, on the radial end of a radial arm which can be pivoted about a pivot axis offset parallel to the axis of rotation in such a way that the resulting eccentric pivoting of the support rollers causes their distance from the axis of rotation to change in an adjustable manner. The support rollers can, for example, be arranged in a common support roller holder. The support roller holder is mounted eccentrically in the handle. This arrangement causes a rotary movement of the support roller holder relative to the handle to adjust the distance between the support rollers and the handle or the axis of rotation and thus the angle of inclination of the axis of rotation. A preferred embodiment can consist in that the arm orThe support roller holder can be pivoted into two positions corresponding to the end positions of the pivoting range of the boom or the support roller holder, and can preferably be locked there. These two positions can advantageously be such, for example, that the angle of inclination of the rotation axis in these positions is equal to the most common grinding angles of 15° and 20°.

[0036] A second advantageous development of a roller grinder can consist in that the support rollers are arranged at a variably adjustable distance from one another, based on the distance between the axes of rotation of the support rollers, in each case at the radial end of a radial arm, wherein at least one arm is pivotable about the axis of rotation in such a way that the resulting spreading out or closing of the arms changes the distance between the support rollers and thus the angle of inclination of the axis of rotation in an adjustable manner. A preferred embodiment can consist in that one arm is fixedly connected to the handle relative to the latter and the other arm is pivotable, preferably lockable. The pivotable arm can be held in a locked position, for example by means of a compression spring.To set a different angle of inclination, the pivoting arm can then be pulled back against the spring pressure, pivoted into the desired angular position, and released to engage the selected notch. In this way, for example, a multi-stage adjustment of the angle of inclination of the rotation axis, preferably 0°, 10°, 12.5°, 15°, 17.5°, 20°, 22.5°, and 25°, can be achieved.

[0037] A third advantageous development of a roller grinder can consist in that the support rollers are arranged at a fixed distance from one another, based on the distance between the axes of rotation of the support rollers, and in a fixed position relative to the handle in the region of the rear longitudinal end of the handle, and the adjusting device comprises a pivotable holder for the rolling disc, by means of which the inclination of the rolling disc and thus the angle of inclination of the axis of rotation can be adjusted, preferably lockable with a latch. By pivoting the rolling disc, which can be adjusted by means of the pivoting holder, the processing disc attached to it and thus the processing plane of the processing surface can be adjustably pivoted. This can preferably be done in a latching manner in several stages by sliding the pivoting holder back and forth using a latching lever.

[0038] A fourth advantageous development of a roller grinder can consist in that the support rollers are arranged at a fixed distance from one another, based on the distance between the axes of rotation of the support rollers, on the radial end of a common radial boom which is pivotably mounted relative to the axis of rotation of the roller grinder by means of a boom joint in such a way that when the boom is pivoted the distance of the support rollers from the axis of rotation changes in an adjustable manner. The support rollers can, for example, be arranged in a common support roller holder. Adjusting the boom in the boom joint leads to an adjustment of the distance of the support rollers from the handle or the axis of rotation and thus the angle of inclination of the axis of rotation.

[0039] A preferred embodiment of this fourth development can consist in the boom being adjustable by means of a cam control which comprises a rotatable cam disk arranged at the rear longitudinal end of the roller grinder and having a cam disk groove in which a driver of the boom is guided. With this arrangement, a rotary movement of the cam disk relative to the handle produces an adjustment of the distance of the support rollers to the handle or the axis of rotation and thus the angle of inclination of the axis of rotation. The advantage of a cam control is that the angle of inclination of the axis of rotation is continuously adjustable. A further preferred development can be that the boom can be pivoted by means of the cam control into two positions which correspond to the end positions of the pivoting range of the boom, and can preferably be locked in these end positions with a latch.It can advantageously be provided that the cam control has a detent by means of which the boom can be locked in an intermediate position or in a plurality of intermediate positions between the end positions. A fifth advantageous development of a roller grinder can consist in that the support rollers are arranged at a fixed distance from one another, based on the distance between the axes of rotation of the support rollers, on the radial end of a radial boom which is part of a link or is connected to a link which can be moved out of the handle and into the handle by means of an eccentric in such a way that the distance of the support rollers from the axis of rotation changes in an adjustable manner. The support rollers can, for example, be arranged in a common support roller holder, boom or the link.The linkage and thus the boom are mounted in the handle and by actuating the eccentric arranged in the handle, for example by means of a rotary movement, the distance of the support rollers from the axis of rotation is increased or decreased depending on the direction of actuation of the eccentric and thus the angle of inclination of the axis of rotation is changed. A preferred further development can consist in the eccentric and thus the linkage or the boom being lockable in two or more positions. These positions can advantageously be such, for example, that the angle of inclination of the axis of rotation in these positions is equal to the most common grinding angles, which advantageously are or include in particular the angles 15° and 20°.

[0040] A roller grinder according to the invention is preferably designed such that the processing disk is detachably attached to the rolling disk. It can then be replaced and the roller grinder is provided, designed and suitable for various processing operations (grinding, polishing, deburring or honing). According to an advantageous feature which can also be advantageously used in roller grinders known from the prior art independently of the roller grinder according to the invention, it can be provided that the processing disk can be detachably attached to the rolling disk by means of a force-fitting connection. For example, the processing disk can have at least one elastic element on its circumference, for example an elastic ring or O-ring inserted into a circumferential groove, with which it can be inserted into a corresponding end-face receptacle of the rolling disk and clamped therein.In this way, the processing disc can be easily inserted and removed again, for example, to moisten it or to replace it with another one. The force-locking fastening of the processing disc in the rolling disc can be enhanced by a form-fitting component, for example, by an undercut in the rolling disc into which the elastic element engages.

[0041] In order to remove a processing disc that is detachably inserted into the rolling disc by means of a force-locking connection, the rolling disc can advantageously have an opening that is arranged such that with a finger pushed through the opening, the back side, i.e. the side of the processing disc facing axially towards the handle, can be reached, and the processing disc can be pressed out of the rolling disc by finger pressure pointing axially away from the handle. According to another advantageous embodiment, the roller grinder can have an ejection rod that is arranged in the axial direction of the handle such that when actuated in the axial direction it presses on the back side of the processing disc facing the rolling disc and thereby presses the processing disc axially out of the rolling disc.Advantageously, it can be provided that the ejection rod is held in its starting position by a spring load and / or that the ejection rod projects out of the handle at the rear longitudinal end of the handle to such an extent that it can be axially displaced by means of axial finger pressure on the end of the ejection rod in order to eject a processing disc from the rolling disc.

[0042] A further advantageous feature which can be used advantageously in roller grinders known from the prior art, independent of the roller grinder according to the invention, can consist in the axial end face of the rolling disk being designed in such a way that the machining disk rests on the rolling disk only at its radial edge and a central region of the machining disk has no contact with the rolling disk. If such a machining disk is only fastened to the rolling disk by its radial outer side, the machining disk can advantageously have a machining surface on both sides. The machining disk can then be used on both sides and can be coated with different machining media on both sides (e.g. on one side for grinding and on the other for honing or with different materials on both sides (e.g.Corundum, diamond, sapphire, ceramic) or with different grain sizes.

[0043] The invention further relates to a roller grinder set, comprising a roller grinder according to the invention and a grinding aid to be arranged on the flat base, with which the cutting tool to be machined with the roller grinder can be held in a defined orientation so that a roller grinder rolling on this base with its rotating machining disk can machine the cutting edge of the cutting tool. A grinding aid described below can also be advantageously used independently of the roller grinder according to the invention with other roller grinders, for example those known from the prior art.

[0044] The grinding aid is intended to solve several tasks. Firstly, there is the problem explained at the beginning that errors can occur when machining the cutting edge of a cutting tool with a roller grinder and a known grinding aid if the user is inattentive and, while machining the cutting edge, places the cutting tool against a contact surface of the grinding aid that has an incorrect positioning angle. Furthermore, small knives, e.g. pocket knives, are very difficult to clamp with the known grinding aids using magnetic force because the blade must be placed so high against the magnetic contact surface that the edge protrudes freely above it. But then the back of the blade is not resting on the surface and the knife handle is also in the air.The magnetic holding force is then usually not sufficient to hold the cutting tool, especially a heavy knife handle, and this slips downwards when the cutting edge is being worked on. Furthermore, with grinding aids where a knife blade is picked up and held by the grinding aid at an angle to the grinding angle, the roller grinder has to be guided in a curved path determined by the knife edge geometry, which requires a little more dexterity from the user. A further problem with known grinding aids is their strong holding magnets, which magnetize the knife steel during grinding. Many of the finest magnetic metal particles removed during grinding stick to the grinding burr formed during processing. This creates an irregular chip structure around the cutting burr. When the cutting burr is subsequently removed, e.g.With a hard metal or ceramic disc, the magnetized metal particles are drawn into the ground area of ​​the cutting edge. This not only unnecessarily scratches this area, but also spreads the metal particles over the entire magnetized cutting surface. To ensure that no magnetized metal chips remain on the cutting edge or the blade, very careful cleaning is required after processing.

[0045] To solve these problems, a grinding aid or a roller grinder set comprising a roller grinder according to the invention and such a grinding aid is used, wherein the grinding aid is to be arranged with a support plane defined on its underside on a flat base and is provided and designed to hold a cutting tool to be machined with the roller grinder in a fixed position and with a predetermined positioning angle relative to this base, so that a roller grinder rolled back and forth on this base and resting against the cutting edge of the cutting tool with a rotating processing disk can machine the cutting edge, and is characterized in that the grinding aid is designed such that the positioning angle of the blade of the cutting tool relative to the support plane is 90 ° and that the grinding aid for clamping and holding the blade has a purely mechanically acting,manually operable clamping device which has a contact surface fixed in the grinding aid and aligned perpendicular to the support plane for applying one side of the blade and a pressure surface which can be moved manually and parallel to the support plane and aligned parallel to the contact surface for pressing the other side of the blade.

[0046] Such a grinding aid is used to clamp the cutting tool in a vertical position to the base with a mechanically acting clamping device, i.e. the cutting edge of the cutting tool to be machined with the roller grinder points vertically upwards. The cutting tool, in particular the blade of a knife, is clamped between the contact surface and the pressure surface and held in position. The grinding aid does not require magnets. A further advantage resulting from the fact that the blade is held at a vertical angle to the base is that the roller grinder always moves in a straight path parallel to the blade or cutting edge when machining the cutting edge.

[0047] The clamping device can be geometrically dimensioned and designed in such a way that most commercially available knives can be securely clamped. If necessary, adapters and / or replaceable contact surfaces and / or pressure surfaces can be provided to adapt the clamping device to the size and / or shape of a cutting tool. A depression or cutout for storing a processing disc, for example in the form of a round, shallow depression, or for setting down the grinding aid, for example in the form of one or more grooves for inserting the unwinding disc and / or the support rollers, can be arranged on the upper side of the body of the grinding aid.

[0048] Such a grinding aid can preferably form a flat, substantially cuboid-shaped body which has a flat underside and an upper side which is spaced therefrom and which can have the same length as the underside, and which has at least one narrow side on which (that is to say at which, in which, parallel to or in the region thereof) the pressure surface is arranged, wherein in order to clamp a cutting tool in the gap between the pressure surface and the contact surface, the pressure surface can be displaced in the direction of the contact surface by means of the clamping device.

[0049] The clamping device and its actuating elements are advantageously arranged in and / or on a housing, the outer shape of which can correspond to that of conventional, solid grinding aids, i.e. is preferably cuboid-shaped, with the displaceable pressure surface being arranged on a narrow side of the housing. According to a first advantageous variant, the contact surface is advantageously designed as part of a holding angle, with one leg of the holding angle forming or supporting the contact surface and the other leg being fastened to a housing of the grinding aid, and the pressure surface being displaceable by means of the clamping device.According to a second advantageous variant, the contact surface is designed as part of a holding bracket, wherein one leg of the holding bracket forms or supports the contact surface and the other leg is fastened to a housing of the grinding aid, and wherein the pressure surface is displaceable by means of the clamping device. In both variants, the clamping device can be actuated, for example, by means of a manually operated slider or by means of manually operated, articulated actuating buttons, possibly with eccentric or lever-like force amplification.

[0050] According to a first advantageous embodiment, the clamping device can be provided with a spring for providing the clamping force required to hold a cutting tool to be machined, wherein the cutting tool is pressed against the contact surface by means of the force exerted by the spring on the pressure surface, and to release the cutting tool, the clamping device can be manually actuated against the spring force. In this variant, the cutting tool is held automatically in the grinding aid under spring load without manual intervention, and to remove the cutting tool, the clamping device is opened manually against the spring force.

[0051] According to a second advantageous embodiment, the clamping device can be designed such that the clamping force required to hold a cutting tool to be machined is generated by pressing the pressure surface against the contact surface by means of a manual force acting on the pressure surface, and this manual force is reduced to release the cutting tool. In this variant, the cutting tool is held manually by hand or finger force without spring force. This embodiment can achieve a higher clamping force and thus greater safety, particularly if the force is amplified by means of a suitable leverage.In order to prevent slipping and / or scratching of a cutting tool held in the grinding aid, it is proposed according to an advantageous feature that the contact surface and / or the pressure surface has an elastically designed surface, for example made of plastic and / or has individual contact elements made of an elastomer and / or a coating with an elastomer.

[0052] Furthermore, the invention relates to a roller grinder set comprising a roller grinder according to the invention and a processing disc for use therewith, in particular a grinding disc. The features of processing discs described below can also be advantageously used in combination with one another and / or independently of the roller grinder according to the invention with other processing discs and / or roller grinders, for example, those known from the prior art.

[0053] The machining discs known from the prior art have various disadvantages. One disadvantage is that attaching and removing the machining discs often takes some time, particularly if they are screwed in or out using a threaded pin located centrally on the machining disc. Another disadvantage is that the known machining discs only have a machining surface on one side, meaning they can only be used on one side. Furthermore, in conventional machining discs with a machining surface made of corundum, the machining surface is glued to a support layer. For this reason, such machining discs can only be used dry and cannot be wetted beforehand for machining the cutting edge, because the ceramic structure of the corundum layer absorbs water when the machining surface is wetted, thereby losing stability and potentially detaching from the adhesive.

[0054] To solve these problems, machining discs or a roller grinder set comprising a roller grinder according to the invention and such a machining disc are proposed below, wherein the machining disc is circular, is provided and designed for attachment to a roller grinder and on which a machining surface for machining the cutting edge of a cutting tool is formed on an axial end face.

[0055] According to a first advantageous feature, which can be used advantageously independently of the roller grinder according to the invention also with processing wheels and / or roller grinders known from the prior art, it can be provided that the processing wheel is designed in such a way that it can be detachably fastened to the rolling wheel by means of a force-fitting connection, and for this purpose has at least one elastic element on its circumference, in particular an elastic ring or O-ring inserted into a circumferential groove, with which it can be inserted into a corresponding end-face receptacle of the rolling wheel and clamped therein. In this way, the processing wheel can be easily inserted and removed again, for example in order to moisten it or to exchange it for another one.

[0056] According to a second advantageous feature, which can also be advantageously used independently of the roller grinder according to the invention with machining wheels and / or roller grinders known from the prior art, it can be provided that the machining wheel is designed such that it rests on the rolling wheel only at its radial edge and a central region of the machining wheel has no contact with the rolling wheel. If such a machining wheel is only attached to the rolling wheel by its radial outer side, the machining wheel can advantageously have a machining surface on both sides.

[0057] According to a third advantageous feature, which can also be used advantageously with processing wheels and / or roller grinders known from the prior art, independently of the roller grinder according to the invention, it can be provided that the processing wheel advantageously has a processing surface on both sides. The processing wheel can then be used on both sides and can be coated with different processing media on both sides (e.g. on one side for grinding and on the other for honing), or on both sides with different materials (e.g. corundum, diamond, sapphire, ceramic) or with different grain sizes.

[0058] According to a fourth advantageous feature, which can be used advantageously independently of the roller grinder according to the invention also with processing wheels and / or roller grinders known from the prior art, it can be provided that the processing wheel has two processing surfaces which are connected to one another in a form-fitting and material-fitting manner. The processing surfaces can, for example, be cast or pressed and can therefore be wetted before use. The wetting dissolves small grinding particles in the processing surfaces, creating a fine grinding mass during grinding. This reduces wear on the processing surface and also the roughness of the processing surface and the associated burr formation on the machined cutting edge.

[0059] According to a fifth advantageous feature, which can be advantageously used independently of the roller grinder according to the invention, even with machining wheels and / or roller grinders known from the prior art, the machining wheel can have a machining surface that is positively and materially connected to the machining wheel. The machining surface can, for example, be cast together with the machining wheel.

[0060] According to a sixth advantageous feature, which can be advantageously used independently of the roller grinder according to the invention, also with machining wheels and / or roller grinders known from the prior art, it can be provided that the machining wheel has a machining surface on only one side and that the machining surface is positively connected to the machining wheel. The machining surface positively connected to the machining wheel can, for example, consist of corundum, diamond, sapphire, or ceramic, or a combination of these materials, or can contain one or more of these materials.

[0061] According to a seventh advantageous feature, which can be used advantageously independently of the roller grinder according to the invention also with machining wheels and / or roller grinders known from the prior art, it can be provided that the machining wheel is tempered.

[0062] Further advantages and features of the invention emerge from the claims and the following description, in which exemplary embodiments of the invention are explained in detail with reference to the drawings. The special features described therein can be used individually or in combination to create preferred embodiments of the invention. Identical or equivalent parts are designated by the same reference numerals in the figures and are usually described only once, even if they can be advantageously used in other embodiments. They show:

[0063] Fig. 1 is a side view of a first roller grinder according to the invention,

[0064] Fig. 2 a detail of Fig. 1,

[0065] Fig. 3 a longitudinal section to Fig. 2,

[0066] Fig. 4 is a perspective view of a second roller grinder according to the invention,

[0067] Fig. 5 is another perspective view of Fig. 4,

[0068] Fig. 6 is a rear view of the roller grinder of Fig. 4 in a first use setting,

[0069] Fig. 7 is a side view of Fig. 6,

[0070] Fig. 8 is a rear view of the roller grinder of Fig. 4 in a first intermediate position,

[0071] Fig. 9 is a side view of Fig. 8,

[0072] Fig. 10 is a rear view of the roller grinder of Fig. 4 in a second intermediate position,

[0073] Fig. 11 is a side view of Fig. 10,

[0074] Fig. 12 is a rear view of the roller grinder of Fig. 4 in a second use setting, Fig. 13 is a side view of Fig. 12,

[0075] Fig. 14 is a perspective sectional view of the roller grinder of Fig. 4,

[0076] Fig. 14a is a longitudinal section of the roller grinder of Fig. 4,

[0077] Fig. 15 a first detail of the roller grinder of Fig. 9,

[0078] Fig. 16 a second detail of the roller grinder of Fig. 9,

[0079] Fig. 17 is a sectional view of a third roller grinder according to the invention,

[0080] Fig. 18 is a perspective view of a fourth roller grinder according to the invention,

[0081] Fig. 19 is a sectional view of Fig. 18,

[0082] Fig. 20 is a plan view of the roller grinder of Fig. 18,

[0083] Fig. 21 is a section of Fig. 18 in a first use setting,

[0084] Fig. 22 shows a section to Fig. 18 in a second use setting,

[0085] Fig. 23 a detail of Fig. 18,

[0086] Fig. 24 is a perspective view of a first grinding aid of a roller grinder set according to the invention,

[0087] Fig. 25 is a plan view of Fig. 24,

[0088] Fig. 26 is a front view of Fig. 24,

[0089] Fig. 27 a longitudinal section to Fig. 24,

[0090] Fig. 28 is a perspective view of a second grinding aid of a roller grinder set according to the invention,

[0091] Fig. 29 is a partial side view of Fig. 28 with a clamped blade of a knife,

[0092] Fig. 30 is a perspective view of a third grinding aid of a roller grinder set according to the invention, Fig. 31 is a front view of Fig. 30,

[0093] Fig. 32 a side view of Fig. 30,

[0094] Fig. 33 is a plan view of Fig. 30,

[0095] Fig. 34 is a perspective view of a fourth grinding aid roller grinder set according to the invention,

[0096] Fig. 35 is a further perspective view of the grinding aid of Fig. 34,

[0097] Fig. 36 a detail of Fig. 34,

[0098] Fig. 37 a side view of Fig. 34,

[0099] Fig. 38 a bottom view of Fig. 34,

[0100] Fig. 39 a bottom view of Fig. 35,

[0101] Fig. 40 is a plan view of a first machining disc of a roller grinder set according to the invention,

[0102] Fig. 41 a section to Fig. 40,

[0103] Fig. 42 a first modification of Fig. 41,

[0104] Fig. 43 a second modification of Fig. 41

[0105] Fig. 44 a plan view of a second processing disc of a roller grinder set according to the invention,

[0106] Fig. 45 a section to Fig. 44,

[0107] Fig. 46 a plan view of a third processing disc of a roller grinder set according to the invention,

[0108] Fig. 47 a section to Fig. 46,

[0109] Fig. 48 is a plan view of a fourth machining disc of a roller grinder set according to the invention,

[0110] Fig. 49 a section to Fig. 48,

[0111] Fig. 50 a section through a fifth processing disc of a roller grinder set according to the invention,

[0112] Fig. 51 is a longitudinal section of a fifth roller grinder according to the invention,

[0113] Fig. 52 a partial side view of Fig. 51,

[0114] Fig. 53 a detail of Fig. 51, Fig. 54 a first perspective partial view of Fig.

[0115] 51,

[0116] Fig. 55 a second perspective partial view of Fig.

[0117] 51,

[0118] Fig. 56 a third perspective partial view of Fig.

[0119] 51,

[0120] Fig. 57 a fourth perspective partial view of Fig.

[0121] 51 and

[0122] Fig. 58 is a perspective view of Fig. 51.

[0123] Fig. 1 shows a side view of a first roller grinder 1 according to the invention for manually machining the cutting edge of a cutting tool (not shown), in particular a knife. The roller grinder 1 carries a machining surface 2 designed for grinding, polishing, deburring, or honing the cutting edge of the cutting tool, and comprises a bearing body 4 extending in an axial longitudinal direction 3, in which a rotation axis 5 is arranged that is rotatable relative to the bearing body 4 about its axial longitudinal direction 3. The bearing body 4 is designed as a handle 6 that can be grasped by a user of the roller grinder 1 with the fingers of one hand. Attached to the front longitudinal end 7 of the handle 6 is a circular rolling disc 8 that is mounted so as to be rotatable about the rotation axis 5 relative to the handle 6.

[0124] The rolling disc 8 has on its radial outer side a circumferential friction element 9 which borders the rolling disc 8 along its circumference and whose radial outer diameter is larger than the radial outer diameter of the area of ​​the handle 6 which borders the rolling disc 8 in the axial direction, so that the friction element 9 protrudes radially beyond the rolling disc 8 and the handle 6 at the front longitudinal end 7 of the roller grinder 1. A circular machining disc 10 is fastened to the front longitudinal end 7 of the roller grinder 1 on the axial outer side of the rolling disc 8, i.e. pointing axially away from the handle 6. The machining disc 10 is rotatable about the rotation axis 5 and can be rotated together with the rolling disc 8, and the machining surface 2 for machining the cutting edge of a cutting tool is designed on its axially outer side, i.e. pointing axially away from the handle 6, end face thereof.The radial outer diameter of the machining disc is smaller than the radial outer diameter of the friction element 9.

[0125] In the area of ​​the rear longitudinal end 11 of the handle 6 facing away from the rolling disc 8, two rotatable support rollers 12, 13 are attached to the roller grinder 1, wherein the support rollers 12, 13 or their roller rotation axes 14, 15 or the roller bearings are arranged at a distance from the rotation axis 5. This ensures that the contact points of the support rollers 12, 13, with which they rest on a base 23 during intended use of the roller grinder 1, are at a distance from the rotation axis 5. By means of the adjustment device integrated into the roller grinder 1, this distance and thus the angle of inclination ß can be variably adjusted. The three points of the roller grinder 1 with which it can be placed on a base 23, i.e. the undersides of the friction element 9 and the two support rollers 12, 13, define or form a support plane 16 of the roller grinder 1.When the roller grinder 1 is placed on a flat base 23 for its intended use, the support plane 16 coincides with the surface of the base 23. In the exemplary embodiment in FIG. 1, the axes of rotation 14, 15 are arranged parallel to the axis of rotation 5. In other embodiments of roller grinders 1, the axes of rotation 14, 15 of the support rollers 12, 13 can also be aligned differently. An advantageous embodiment can be that the axes of rotation 14, 15 of the support rollers 12, 13 are inclined as little as possible relative to a base 23 on which the roller grinder 1 rests with the friction element 9 and the support rollers 12, 13 during its intended use, i.e. When using the roller grinder 1, it is preferably arranged almost parallel or parallel to the base 23 or the support plane 16. This allows a good frictional connection and good rolling behavior of the support rollers 12, 13 on the base 23 to be achieved.

[0126] In Fig. 1, the two support rollers 12, 13 are arranged one behind the other, perpendicular to the plane of the drawing, so that only one support roller 12 is visible, which conceals the support roller 13 located behind it. Furthermore, the roller grinder 1 has an adjusting device integrated into the roller grinder 1, by means of which the angle of inclination ß of the axis of rotation 5 of the roller grinder 1 against a base 23, on which the roller grinder 1 rests during its intended use with the friction element 9 and the support rollers 12, 13, can be adjusted to at least one value different from zero. In this inclined position, the distance of the support rollers 12, 13 from the axis of rotation 5 is greater than the distance of the radial outer diameter of the friction element 9 from the axis of rotation 5, so that the distance of the axis of rotation 5, which runs obliquely to the base 23, from the base 23 is smaller at the front longitudinal end 7 than at the rear longitudinal end 11. In Fig.1, the roller grinder 1 is shown at two differently set angles of inclination ß, namely with an angle of inclination ß of 15 ° (shown with solid lines) and an angle of inclination ß of 20 ° (shown with dashed lines). In embodiments of a roller grinder 1 according to the invention designed according to the explained basic principle, other values ​​and / or value ranges can also be provided for the adjustable angle of inclination ß, to which the roller grinder 1 can be continuously or stepwise adjusted or adjusted between different positions, and these can also include the angle of inclination ß of 0 °.

[0127] The adjustment device of the roller grinder 1 for adjusting the angle of inclination ß can be designed in various ways. Fig. 1 shows a first exemplary embodiment of an adjustment device in which the support rollers 12, 13 are arranged at a fixed distance from one another, based on the distance between the axes of rotation 14, 15 of the support rollers 12, 13, on the radial end of a radial arm 17 which serves as a support roller holder and is pivotable about a pivot axis 18 offset parallel to the axis of rotation 5 in such a way that the resulting eccentric pivoting of the support rollers 12, 13 adjustably changes their distance from the axis of rotation 5 and thus the angle of inclination ß. The arm 17 can, for example, be pivotable into two positions which correspond to the end positions of the pivoting range of the arm 17, and can preferably be locked in these positions by locking. The Fig .Fig. 2 shows the roller grinder 1 of Fig. 1 at an angle of inclination ß of 15°. In a window section opened in Fig. 2, a partial section through the roller grinder 1 is shown, in which one can see how the boom 17 can be pivoted by means of a pivot bearing in the handle 6 about a pivot axis 18 offset parallel to the rotation axis 5.

[0128] In the longitudinal section of Fig. 2 shown in Fig. 3, the extension arm 17 is rotated into a different position relative to the handle 1. This illustration also shows that the machining disk 10 is detachably fastened to the rolling disk 8 by means of a force-fitting connection. This configuration can be advantageous for all roller grinders, including, for example, other exemplary embodiments of the invention described below. In the exemplary embodiment of Fig. 3, the machining disk 10 has, for this purpose, on its circumference, an elastic element in the form of an elastic O-ring 20 inserted into a circumferential groove 19, with which it can be inserted into a corresponding end-face receptacle of the rolling disk 8 and clamped therein. In this way, the machining disk 10 can be easily inserted and removed again, for example in order to moisten it or to exchange it for another one.

[0129] In order to remove a processing disk 10 which is detachably inserted into the rolling disk 8 by means of a force-fitting connection, the rolling disk 8 can have an opening which is arranged in such a way that the rear side, i.e. the side of the processing disk 10 which points axially towards the handle 6, can be reached with a finger pushed through the opening and the processing disk 10 can be pressed out of the rolling disk 8 by finger pressure pointing axially away from the handle 6. This variant is not shown in Fig. 3. Fig. 3, however, shows another exemplary embodiment for removing a processing disk 10.For this purpose, the roller grinder 1 has an ejection rod 21 which is arranged in the axial direction of the handle 6 in such a way that, when actuated in the axial direction, it presses on the rear side of the processing disc 10 facing the rolling disc 8 and thereby presses the processing disc 10 axially out of the rolling disc 8.

[0130] In the embodiment shown in Fig. 3, the ejection rod 21 is held in its initial position by a spring load and projects at the rear longitudinal end 11 of the handle 6 with one end out of the handle 6 so far that it can be axially displaced to eject a processing disk 10 from the rolling disk 8 by means of axial finger pressure on the end of the ejection rod 21.

[0131] In Fig. 3, the axial end face of the rolling disc 8 is designed such that the processing disc 10 rests on the rolling disc 8 only at its radial edge and a central region of the processing disc 10 has no contact with the rolling disc. In this case, the processing disc 10 can, as shown, advantageously have a processing surface 2, 2a on both end faces and can be used on both sides, specifically in each case with the side which, when the processing disc 10 is inserted into the rolling disc 8, points axially outwards away from the handle 6. To turn a double-sided processing disc 10, it can simply be removed in the manner described and, turned upside down, reinserted into the rolling disc 8. Fig. 4 illustrates a perspective view of a roller grinder 1 according to the invention, in which the handle 6 is somewhat more tapered or tapered relative to the roller grinder 1 of Fig. 3.is more convex in shape, a second embodiment of an adjustment device. In this embodiment, the support rollers 12, 13 are each arranged at the radial end of a radial arm 17, 17a with a variably adjustable distance from one another, based on the distance between the axes of rotation 14, 15 of the support rollers 12, 13, wherein at least one arm 17 is pivotable about the axis of rotation 5 in such a way that the resulting spreading out or closing of the arms 17, 17a changes the distance between the support rollers 12, 13 and thus the angle of inclination ß of the axis of rotation 5. In the embodiment shown, one arm 17a is fixedly connected to the handle 6 relative to the latter, and the other arm 17 is pivotable, preferably lockable with a detent 22. Fig. 5 shows the roller grinder 1 of Fig. 4 in another perspective view.

[0132] Fig. 6 to 13 illustrate how the roller grinder 1 of Fig. 4 is changed over from one inclination angle ß of 15° to another inclination angle ß of 15° by means of the adjustment device. A rear view (Fig. 6, 8, 10 and 12) and a side view (Fig. 7, 9, 11 and 13) are shown for each of the successive steps. In Figs. 6 and 7, the roller grinder 1 is in a first use setting for machining a cutting tool with an inclination angle ß of 15°. Here, the arms 17, 17a are spread apart, the roller rotation axes 14, 15 of the support rollers 12, 13 are at a distance from one another and the adjustment device is locked in this position.

[0133] To adjust the angle of inclination ß, in a first step shown in Figs. 8 and 9, the rear longitudinal end 11 with the pivotable arm 17 attached thereto is first pulled away from the handle 6 in the axial direction, i.e. in the direction of the rotation axis 5. In doing so, the distance between the pivotable arm 17 and the arm 17a fixedly attached to the handle 6 increases, whereby the locking mechanism 22 acting between the two arms 17, 17a is released, so that the pivotable arm 17 can then be pivoted.

[0134] Figs. 10 and 11 show this second step, in which the extended, pivotable boom 17 is pivoted about the rotation axis 5. In the process, the distance between the roller rotation axes 14, 15 is reduced. In the subsequent step, illustrated in Figs. 12 and 13, in order to determine the changed angle of inclination ß, the rear longitudinal end 11 with the pivotable boom 17 attached to it is pushed in the axial direction, i.e. in the direction of the rotation axis 5, towards the handle 6. In the process, the distance between the pivotable arm 17 and the arm 17a fixedly attached to the handle 6 is reduced, whereby the locking mechanism 22 acting between the two arms 17, 17a engages again, so that the pivotable arm 17 is subsequently locked relative to the fixed arm 17 and the roller grinder 1 is again in a use setting (with a changed angle of inclination ß).Because with this adjustment of the arms 17, 17a the distance between the roller rotation axes 14, 15 is smaller compared to the distance in the starting position according to Fig. 6 and 7, the distance of the rotation axis 5 from the base 23 and thus the angle of inclination ß has increased at the rear longitudinal end 11 of the roller grinder 1 by adjusting the arms 17, 17a, in the exemplary embodiment from 15° to 20°.

[0135] In Figs. 7 and 13, it can be seen that the support rollers 12, 13 are slightly offset from one another in the axial direction, i.e., they do not run one behind the other in the same track. To ensure good guidance of the roller grinder 1, it is advantageous if the distance between the planes in which the two support rollers 12, 13 rotate is less than 2 cm, preferably less than 1 cm, and particularly preferably less than 0.5 cm. To achieve a small axial distance between the support rollers 12, 13, one of the two arms 17, 17a, or both, can be canted, offset, or bent.

[0136] Fig. 14 shows a perspective, sectional view of the roller grinder 1 from Fig. 4, which is placed with the friction element 9 and the two support rollers 12, 13 on a flat base 23 such that the support plane 16 of the roller grinder 1 coincides with the surface of the base 23. Also visible here is a compression spring 24, with which the rotatable, rear longitudinal end 11 of the roller grinder 1 with the adjustable extension arm 17 attached thereto is pressed against the other part of the handle 6 with the extension arm 17a firmly attached thereto when the roller grinder 1 is in use, thereby fixing the detent 22 in the respective position. For adjustment, the rotatable, rear longitudinal end 11 of the roller grinder 1 is pulled axially outwards against the compression spring 24 and can then be rotated. Fig. 14a shows a longitudinal section of the roller grinder of Fig. 4 and thus largely corresponds to Fig. 14, without the perspective view there.

[0137] 15 and 16 show details of the roller grinder 1 of Fig. 9. The locking mechanism 22 is realized by one or more locking pins 25 which protrude from the rotatable, rear longitudinal end 11 of the roller grinder 1 in the axial direction towards the opposite part of the handle 6. This opposite part has associated recesses 26 which are offset from one another on a circular arc and into which the locking pins 25 engage to lock the extension arm 17 when the roller grinder 1 is in use and are pulled out when the extension arm 17 is rotated. Conversely, the locking pins 25 could also be arranged on the part of the handle 6 to which the fixed extension arm 17a is connected, and the recesses 26 on the rotatable part of the handle 6 on which the pivotable extension arm 17 is arranged.

[0138] Fig. 17 shows a sectional view of a roller grinder 1 according to the invention with a third embodiment of an adjustment device. Here, the support rollers 12, 13 are arranged at a fixed distance from one another, based on the distance between the axes of rotation 14, 15 of the support rollers 12, 13, and in a fixed position relative to the handle 6 in the region of the rear longitudinal end 11 of the handle 6. The adjustment device comprises a pivotable receptacle 27 for the rolling disc 8, by means of which the inclination of the rolling disc 8 and thus the angle of inclination β of the axis of rotation 5 can be adjusted, preferably lockable. In the handle 6 there is a cavity with a base 28, to which one end of the pivotable receptacle 27 is articulated on a pivot axis 29. The other end of the pivotable holder 27 is connected via a cross pin 30 to a locking lever 31 which has a locking pin 32.Through this adjustment possibility of the tilt angle of the holder 27 relative to the base 23, the tilt angle of the rolling disc 8, which is rotatably mounted in the holder 27 by means of a bearing 33, and thus the angle of inclination β of the axis of rotation of the rolling disc 8 and the processing disc 10 with the processing surface 2 can be adjusted. The processing disc 10 is fastened in the rolling disc 8 by means of an O-ring 20. The friction element 9 is also designed as an elastic O-ring, as in the other embodiments. It may be expedient to provide an auxiliary spring 34.

[0139] Fig. 18 illustrates a fourth exemplary embodiment of an adjustment device in a perspective view of a roller grinder 1 according to the invention. For better visibility, the bearing body 4 or the handle 6 is not shown in this illustration. In this exemplary embodiment, the support rollers 12, 13 are arranged at a fixed distance from one another, based on the distance between the axes of rotation 14, 15 of the support rollers 12, 13, on the radial end of a common radial arm 17 which is pivotably mounted relative to the axis of rotation 5 of the roller grinder 1 by means of a arm joint 80 such that when the arm 17 is pivoted, the distance of the support rollers 12, 13 from the axis of rotation 5 and thus the angle of inclination β of the axis of rotation 5 changes in an adjustable manner.The support rollers 12, 13 are arranged in a common support roller holder, which is attached to the boom 17, and form, in a sense, a component of a chassis with which the roller grinder 1 can be rolled on a flat surface. Adjusting the boom 17, which is articulated by means of the boom joint 80, leads to an adjustment of the distance between the support rollers 12, 13 and the handle 6 or the rotation axis 5, and thus the angle of inclination ß of the rotation axis 5.

[0140] An advantageous embodiment of a boom joint 80 is a film joint. However, other embodiments of rotary or tilting joints can also be used advantageously. Advantageously, the boom 17 is adjustable, as shown, by means of a cam control, which comprises a rotatable cam disc 81 arranged at the rear longitudinal end 11 of the roller grinder 1 and having a cam disc groove 82 in which a driver 83 of the boom 17 is guided. Due to this arrangement, a rotary movement of the cam disc 81 by means of the adjusting wheel 84 relative to the handle 6 produces an adjustment of the distance of the support rollers 12, 13 from the handle 6 or the rotation axis 5 and thus the angle of inclination β of the rotation axis 5.

[0141] Fig. 19 shows a sectional view of the roller grinder 1 of Fig. 18. It can also be seen that in this embodiment, the O-ring 20 is not located in a groove in the machining disk 10, but in a groove in the rolling disk 8. Fig. 20 shows a top view of the roller grinder 1 of Fig. 18.

[0142] Fig. 21 shows a section through Fig. 18 in a first use setting and Fig. 22 shows a section through Fig. 18 in a second use setting of the roller grinder 1. These figures illustrate how the roller grinder 1 is changed over from an angle of inclination ß of 25 ° to another angle of inclination ß of 10 ° by means of the adjustment device comprising a cam control, in that the cam disk 81 is rotated by means of the adjusting wheel 84 and in this way the driver 83 of the boom 17, which is guided in the cam disk groove 82 in the area of ​​the rear longitudinal end 11 of the roller grinder 1, is moved so that it assumes a different distance from the axis of rotation 5 of the roller grinder 1. Since the boom 17 is articulated with its end pointing towards the front longitudinal end 7 of the roller grinder 1 to the boom joint 80, the angle of inclination ß of the rotation axis 5 of the roller grinder 1 changes.

[0143] Figs. 21 and 22 show a wave washer 85, which is arranged between the handle 6 and the cam disc 81 and, with its spring pressure, ensures that the system is free from play. Furthermore, the figures show an actuating element 86 for the ejection rod 21 for pressing the processing disc 10 out of the rolling disc 8, a ball bearing 87, and a pressure piece 88.

[0144] Fig. 23 shows, in a detail of Fig. 18, a cam control with a detent, by means of which the boom 17 can be locked in a number of positions. In the exemplary embodiment shown, there are a total of four positions, namely the two end positions of the swivel range of the boom 17, which correspond to the maximum and minimum angle of inclination, as well as two intermediate positions in between. For this purpose, the cam disk 81 has four detent positions 89 in the cam track 90 of the cam disk groove 82, as well as an integrated spring mechanism 91 which holds the driver 83 in the detent position. The driver 83 is integrated into the boom 17 with the support roller holder.

[0145] Fig. 24 shows a perspective view of a first embodiment of a grinding aid 35 of a roller grinder set according to the invention, which is to be arranged with a support plane defined on its underside on a flat base 23 and is intended and designed to hold a cutting tool to be machined with a roller grinder 1 in a fixed position and with a predetermined positioning angle relative to this base 23, so that a roller grinder 1 rolled back and forth on this base 23 and resting against the cutting edge of the cutting tool with a rotating processing disk 10 can machine the cutting edge.The grinding aid 35 is designed such that the positioning angle of the blade of the cutting tool relative to the support plane is 90°, and that the grinding aid 35 has a purely mechanical, manually operable clamping device for clamping and holding the blade. This clamping device has a contact surface 36 which is fixed in the grinding aid 35 and oriented perpendicular to the support plane for applying one side of the blade, and a pressure surface 38 which is manually displaceable and parallel to the support plane and oriented parallel to the contact surface 36 for pressing the other side of the blade. The blade is therefore firmly clamped in the gap between the contact surface 36 and the pressure surface 38, with the pressure surface 38 lying on one side of the blade pressing the blade against the contact surface 36 on the other side of the blade, thereby holding and positioning it.The grinding aid 35 forms a flat, substantially cuboid-shaped body which has a flat underside and an upper side spaced therefrom, which can have the same length as the underside, and which has at least one narrow side 39 on which the pressure surface 38 is arranged, wherein in order to clamp a cutting tool in the gap between the pressure surface 38 and the contact surface 36, the pressure surface 38 can be displaced by means of the clamping device in the direction of the contact surface 36 relative to the housing.

[0146] The contact surface 36 is designed as part of a holding angle, wherein one leg of the holding angle forms or supports the contact surface 36 and the other leg is fastened to a housing of the grinding aid 35, and wherein the pressure surface 38 is displaceable by means of the clamping device. The clamping force required to hold a cutting tool to be machined in the grinding aid 35 is provided by a spring 40, wherein the cutting tool is pressed against the contact surface 36 by means of the force exerted by the spring 40 on the pressure surface 38, and to release the cutting tool the clamping device can be actuated manually against the spring force. The manual actuation takes place using two oppositely arranged actuating buttons 41 which can be actuated by the thumb and fingers of one hand.

[0147] The grinding aid 35 of Fig. 24 is further illustrated in Figs. 25 to 27, wherein Fig. 25 shows a plan view of Fig. 24, Fig. 26 a front view of Fig. 24 and Fig. 27 a longitudinal section of Fig. 24. In Fig. 27 it can be seen that the contact surface 36 and / or the pressure surface 38 have an elastically designed surface, in particular consist of plastic and / or can have individual contact elements made of an elastomer and / or a coating with an elastomer.

[0148] Fig. 28 shows a perspective view of a second grinding aid 35 of a roller grinder set according to the invention. In this case, the clamping device is designed such that the clamping force required to hold a cutting tool to be machined is generated by the pressure surface 38 being pressed against the contact surface 36 by means of a manual force acting on the pressure surface 38, and this manual force is reduced to release the cutting tool. This pressing is carried out by means of a clamping slide 42. On the top side of the housing there is a shelf 43 for a processing disk 10 and a holding recess 44 for inserting the rolling disk 8 of a roller grinder 1 during storage. An anti-slip elastomer pad 45 is arranged on the underside.

[0149] The pressure surface 38 has an elastically formed surface and the contact surface 36 is made of plastic, which can be seen more clearly in the partial side view of Fig. 28 shown in Fig. 29. As a result, the blade 46 of a cutting tool, whose cutting edge 47 is to be machined and which is clamped between the contact surface 36 and the pressure surface 38, is both fixed in a slip-proof manner and protected against scratching by the clamping.

[0150] Fig. 30 shows a perspective view of a third grinding aid 35 of a roller grinder set according to the invention. It corresponds to the grinding aid 35 of Fig. 24 with the difference that the fixed contact surface 36 is formed on the housing of the grinding aid 35 and the displaceable pressure surface 38 is formed as part of a holding angle, one leg of the holding angle forming or carrying the pressure surface 38 and the other leg being displaceable by means of the clamping device. The holding angle is part of a clamping slide 92 which is displaceable by means of the clamping device. Fig. 31 shows an end view of Fig. 30, Fig. 32 a side view of Fig. 30 and Fig. 33 a plan view of Fig. 30. In Fig.33 shows springs 40 which provide the clamping force required to hold a cutting tool to be machined in the grinding aid 35. The cutting tool is pressed against the contact surface 36 by means of the force exerted by the springs 40 on the pressure surface 38, and to release the cutting tool, the clamping device can be actuated manually against the spring force. Manual actuation is effected by two oppositely arranged actuating buttons 41 which can be actuated by the thumb and fingers of one hand.

[0151] Fig. 34 shows a perspective view of a fourth grinding aid 35 of a roller grinder set according to the invention. It corresponds to the grinding aid 35 of Fig. 30 with the difference that it only has one actuating button 41. In Fig. 34, the grinding aid 35 is shown when the actuating button 41 is not pressed, i.e. the grinding aid 35 is in the closed basic position. In this position, the pressure surface 38 is pressed against the contact surface 36 by means of the force exerted by the springs 40 and a cutting edge of a cutting tool located in the gap between them would thereby be clamped. Fig. 35 shows the grinding aid of Fig. 34 with the actuating button 41 pressed, i.e. the grinding aid 35 is in the open position.In this position, the pressure surface 38 is pushed away from the contact surface 36 against the force exerted by the springs 40. The gap between them is opened to allow the cutting edge of a cutting tool to be inserted or removed. Fig. 36 shows a detail of Fig. 34, and Fig. 37 shows a side view of Fig. 34, in which the base plate 93 of the housing and a friction-increasing or anti-slip elastomer pad 45 arranged thereon can be seen on the underside.

[0152] Fig. 38 shows a bottom view of Fig. 34 and Fig. 39 a bottom view of Fig. 35, each with the housing open, i.e. without the base plate 93. Here one can see both the springs 40 and a push rod or push rod 94 of a toggle lever control, with which the movement of the actuating button 41 is transmitted to a movement of the pressure surface 38.

[0153] Figs. 40 to 43 show various machining discs 10 of roller grinder sets according to the invention with machining surfaces 2.

[0154] Fig. 40 shows a plan view of a first machining disk 10 of a roller grinder set according to the invention, and Fig. 41 shows a section of Fig. 40. It can be seen that the machining disk 10 has a machining surface 2, 2a on both sides, which are arranged on a support layer 48. An O-ring can be inserted into the circumferential groove 19 to fix the machining disk 10 in a rolling disk 8. Fig. 42 shows, in a first modification of Fig. 41, a machining disk 10 with two cast machining layers 2, 2a, for example 3000 grit corundum on one side and 6000 grit corundum on the other side. Fig. 43 shows, in a second modification of Fig. 41, a machining disk 10 with a one-sided, form-fitting cast machining layer 2, for example corundum.

[0155] Figs. 44 to 47 show machining discs 10 of the inventive roller grinder sets with corundum. Fig. 44 shows a plan view of a second machining disc 10 of the inventive roller grinder set, which is shown in section in Fig. 45. Fig. 46 shows a plan view of a third machining disc 10 of the inventive roller grinder set, which is shown in section in Fig. 47.

[0156] Fig. 48 shows a plan view of a fourth machining disc 10 of a roller grinder set according to the invention, which is shown in section in Fig. 49.

[0157] In this case, one processing surface 2 has a diamond coating of 46 pm and the other processing surface 2a has a ceramic coating.

[0158] Fig. 50 shows a section through a fifth processing disc 10 of a roller grinder set according to the invention, which is shown inserted into a roller grinder 1 in Fig. 19 and in which the O-ring for clamping the processing disc in the rolling disc is not seated in a groove in the processing disc, but in a groove in the rolling disc 8. Fig. 51 shows, in a sectioned longitudinal section, a fifth embodiment of an adjustment device of a fifth roller grinder 1 according to the invention for manually machining the cutting edge of a cutting tool (not shown), in particular a knife. The roller grinder 1 corresponds in its basic structure to that shown in Figs.1 to 3 and carries a processing surface 2 which is designed for grinding, polishing, deburring or honing the cutting edge of the cutting tool, and comprises a bearing body 4 extending in an axial longitudinal direction 3, in which a rotation axis 5 is arranged which is rotatable relative to the bearing body 4 about its axial longitudinal direction 3. The bearing body 4 is designed as a handle 6 which can be grasped by a user of the roller grinder 1 with the fingers of one hand. At the front longitudinal end 7 of the handle 6 there is attached a circular rolling disc 8 which is mounted so as to be rotatable about the rotation axis 5 relative to the handle 6.

[0159] The rolling disc 8 has on its radial outer side a circumferential friction element 9 which borders the rolling disc 8 along its circumference and whose radial outer diameter is larger than the radial outer diameter of the area of ​​the handle 6 which borders the rolling disc 8 in the axial direction, so that the friction element 9 protrudes radially beyond the rolling disc 8 and the handle 6 at the front longitudinal end 7 of the roller grinder 1. A circular machining disc 10 is fastened to the front longitudinal end 7 of the roller grinder 1 on the axial outer side of the rolling disc 8, i.e. pointing axially away from the handle 6. The machining disc 10 is rotatable about the rotation axis 5 and can be rotated together with the rolling disc 8, and the machining surface 2 for machining the cutting edge of a cutting tool is designed on its axially outer side, i.e. pointing axially away from the handle 6, end face thereof.The radial outer diameter of the machining disc is smaller than the radial outer diameter of the friction element 9.

[0160] In the area of ​​the rear longitudinal end 11 of the handle 6 facing away from the rolling disc 8, two rotatable support rollers 12, 13 are attached to the roller grinder 1, wherein the support rollers 12, 13 or their roller rotation axes 14, 15 or the roller bearings are arranged at a distance from the rotation axis 5. This ensures that the contact points of the support rollers 12, 13, with which they rest on a base 23 during intended use of the roller grinder 1, are at a distance from the rotation axis 5. By means of the adjustment device integrated into the roller grinder 1, this distance and thus the angle of inclination ß can be variably adjusted. The three points of the roller grinder 1 with which it can be placed on a base 23, i.e. the undersides of the friction element 9 and the two support rollers 12, 13, define or form a support plane 16 of the roller grinder 1.When the roller grinder 1 is placed on a flat base 23 for its intended use, the support plane 16 coincides with the surface of the base 23.

[0161] In the embodiment of Fig. 51, the axes of rotation 14, 15 are inclined as little as possible with respect to a base 23 on which the roller grinder 1 rests during its intended use with the friction element 9 and the support rollers 12, 13, i.e., when the roller grinder 1 is in use, they are preferably arranged almost parallel or parallel to the base 23 or the support plane 16. This makes it possible to achieve good frictional engagement and good rolling behavior of the support rollers 12, 13 on the base 23. In other embodiments of roller grinders 1, the axes of rotation 14, 15 of the support rollers 12, 13 can also be aligned differently, for example parallel to the axis of rotation 5.

[0162] In Fig. 51, the two support rollers 12, 13 are arranged one behind the other perpendicular to the plane of the drawing, so that only one support roller 12 is visible, which conceals the support roller 13 located behind it. Furthermore, the roller grinder 1 has an adjusting device integrated into the roller grinder 1, by means of which the angle of inclination ß of the rotational axis 5 of the roller grinder 1 against a base 23, on which the roller grinder 1 rests during its intended use with the friction element 9 and the support rollers 12, 13, can be adjusted to at least one value different from zero. In this inclined position, the distance of the support rollers 12, 13 from the rotation axis 5 is greater than the distance of the radial outer diameter of the friction element 9 from the rotation axis 5, so that the distance of the rotation axis 5, which runs obliquely to the base 23, from the base 23 is smaller at the front longitudinal end 7 than at the rear longitudinal end 11.

[0163] Fig. 51 shows the roller grinder 1 with an inclination angle ß set to 15°. The adjustment device of the roller grinder 1 for adjusting the inclination angle ß can be designed in various ways. Fig. 51 shows a fifth exemplary embodiment of an adjustment device in which the support rollers 12, 13 are arranged at a fixed distance from one another, based on the distance between the axes of rotation 14, 15 of the support rollers 12, 13, on the radial end of a radial arm 17 which is part of a link 95 or is connected to a link 95 which can be moved out of the handle 6 and into the handle 6 by means of an eccentric 96 in such a way that the distance of the support rollers 12, 13 from the axis of rotation 5 and thus the inclination angle ß changes in an adjustable manner. Preferably, the link 95 can be locked in two or more positions.

[0164] In the embodiment of the roller grinder 1 in Fig. 51, the adjustment device comprises, in addition to the eccentric 96 and the link 95, an intermediate piece 97 which holds the axis 98 in position so as to prevent rotation. The axis 98 has toothings into which an integrated ball push piece 99 engages. A disk magnet 100 fixes the eccentric 96 and presses the link 95 onto the intermediate piece 97. A rotary handle 101, which is connected, for example, to the eccentric 96 in a force-fitting manner, is used to adjust the eccentric 96 and the angle of inclination β. An actuator 103, which can be actuated, for example, with the thumb, is used to change the processing disk 10. When the actuator 103 is pressed forward, i.e. towards the front longitudinal end 7, it presses and tilts the processing disk 10 out of the rolling disk 8.

[0165] Fig. 52 shows a partial side view of Fig. 51 and Fig. 53 a detail of Fig. 51. For better visibility, the bearing body 4 or the handle 6 is not shown in either illustration. Fig. 54 shows a first perspective partial view of Fig. 51, in which it can be seen in particular how the intermediate piece 97 holds the axis 98 in position so as to be secured against rotation. Fig. 55 shows a second perspective partial view of Fig. 51, in which it can be seen in particular how the link 95 can be moved transversely to the axis 98 by means of the eccentric 96. A centering pin 102 in the intermediate piece 97 keeps the link 95 guided laterally.

[0166] Fig. 56 illustrates in a third perspective partial view of Fig. 51 how the ball pressing piece 99 in the eccentric 96 engages in the axial toothings in several defined angular positions of the axis 98, for example in six angular positions which correspond to inclination angles ß of 12.5° to 25°. Fig. 57 shows a fourth perspective partial view of Fig. 51, in which it can be seen in particular how the disc magnet 100 fixes the eccentric 96 and presses the link 95 onto the intermediate piece 97, whereby the adjusting device is free of play and does not require any further connecting elements. Fig. 58 shows a perspective view of Fig. 51, in which in particular the rotary handle 101 connected to the eccentric 96 can be seen.

[0167] Advantageous features and special features of the invention and advantageous further developments can be briefly summarized as follows:

[0168] 1. A roller grinder (1) for manually machining the cutting edge (47) of a cutting tool, in particular a knife, by means of a machining surface (2) fastened to the roller grinder (1) and designed for grinding, polishing, deburring or honing the cutting edge (47), comprising a bearing body (4) extending in an axial longitudinal direction (3), in which a rotational axis (5) is arranged that is rotatable relative to the bearing body (4) about its axial longitudinal direction (3), wherein the bearing body (4) is designed as a handle (6) that can be grasped by a user of the roller grinder (1) with the fingers of one hand, a circular rolling disc attached to a front longitudinal end (7) of the handle (6)

[0169] (8) which is mounted so as to be rotatable about the rotation axis (5) relative to the handle (6), wherein the rolling disc (8) has on its radial outer side a circumferential friction element (9) which surrounds the rolling disc (8) along its circumference and whose radial outer diameter is larger than the radial outer diameter of the area of ​​the handle (6) which adjoins the rolling disc (8) in the axial direction, so that the friction element

[0170] (9) at the front longitudinal end (7) of the roller grinder (1) protrudes radially beyond the rolling disc (8) and the handle (6), and a circular processing disc

[0171] (10) which is fastened to the front longitudinal end (7) of the roller grinder (1) axially on the outside, i.e. axially pointing away from the handle (6), about the rotation axis (5) on the axial outside of the rolling disc (8) and is rotatable together with the rolling disc (8) and on whose axially outside, i.e. axially pointing away from the handle (6), end face the machining surface (2) for machining the cutting edge (47) of a cutting tool is formed, wherein the machining disc (10) has a radial outer diameter which is smaller than the radial outer diameter of the friction element (9), characterized in that the roller grinder (1) has at least two support rollers (12, 13) in the region of the rear longitudinal end (11) of the handle (6) facing away from the rolling disc (8), wherein the support rollers (12, 13), the roller rotation axes (14, 15) or the Roller bearings are arranged at a distance from the axis of rotation (5),and an adjustment device integrated into the roller grinder (1), by means of which the angle of inclination (ß) of the axis of rotation (5) of the roller grinder (1) against a base (23), on which the roller grinder (1) rests during its intended use with the friction element (9) and the support rollers (12, 13), can be adjusted to at least one value different from zero, wherein the distance of the support rollers (12, 13) from the axis of rotation (5) is greater than the distance of the radial outer diameter of the friction element (9) from the axis of rotation (5), so that the distance of the axis of rotation (5), which runs obliquely to the base (23), from the base (23) is smaller at the front longitudinal end (7) than at the rear longitudinal end (11). Roller grinder (1) according to item 1, characterized in that the distance between the planes in which the at least two support rollers (12, 13) rotate is less than 2 cm, preferably less than 1 cm and particularly preferably less than 0,5 cm. Roller grinder (1) according to one of the preceding numbers, characterized in that the angle of inclination (ß) of the rotation axis (5) is continuously adjustable between different positions. Roller grinder (1) according to one of the preceding numbers, characterized in that the angle of inclination (ß) of the rotation axis (5) is steplessly adjustable between different positions. Roller grinder (1) according to one of the preceding numbers, characterized in that the angle of inclination (ß) of the rotation axis (5) is adjustable to values ​​between 0° and 30° and / or to values ​​between 0° and 10° and / or to values ​​between 10° and 30°. Roller grinder (1) according to one of the preceding claims, characterized in that the angle of inclination (ß) of the rotation axis (5) is adjustable to a minimum value which is greater than or equal to 0°, 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9° or 10°, and / or to a maximum value which is less than or equal to 20°, 21°,22°, 23°, 24°, 25°, 26°, 27°, 28°, 29° or 30°. Roller grinder (1) according to one of the preceding claims, characterized in that the bearing body (4) designed as a handle (6), in which a rotation axis (5) is arranged that is rotatable relative to the bearing body (4) about its axial longitudinal direction, is completely or predominantly solid, except for the openings, bores and depressions in the bearing body (4) required for receiving, holding and supporting the other elements of the roller grinder (1). Roller grinder (1) according to one of the preceding figures, characterized in that the support rollers (12, 13) are arranged at a fixed distance from one another, relative to the distance between the axes of rotation (14, 15) of the support rollers (12, 13), at the radial end of a radial arm (17) which is pivotable about a pivot axis (18) offset parallel to the axis of rotation (5),that the resulting eccentric pivoting of the support rollers (12, 13) adjustably changes their distance from the rotation axis (5). A roller grinder (1) according to the preceding paragraph, characterized in that the arm (17) is pivotable into two positions corresponding to the end positions of the pivoting range of the arm (17), and can preferably be locked in place there. Roller grinder (1) according to one of the preceding figures, characterized in that the support rollers (12, 13) are arranged at a fixed distance from one another, based on the distance between the axes of rotation (14, 15) of the support rollers (12, 13), on the radial end of a radial arm (17) which is part of a link (95) or is connected to a link (95) which can be moved out of the handle (6) and into the handle (6) by means of an eccentric (96) in such a way that the distance between the support rollers (12,13) from the rotational axis (5). A roller grinder (1) according to the preceding paragraph, characterized in that the link (95) can be locked in two or more positions. A roller grinder (1) according to one of the preceding paragraphs, characterized in that the support rollers (12, 13) are arranged at a variably adjustable distance from one another, relative to the distance between the rotational axes (14, 15) of the support rollers (12, 13), each at the radial end of a radial arm (17, 17a), wherein at least one arm (17) is pivotable about the rotational axis (5) in such a way that the resulting spreading or closing of the arms (17, 17a) adjustably changes the distance between the support rollers (12, 13) and thus the angle of inclination (ß) of the rotational axis (5). A roller grinder (1) according to the preceding paragraph, characterized in thatthat one arm (17a) is fixedly connected to the handle (6) relative to the latter, and the other arm (17) is pivotable, preferably lockable with a latch. Roller grinder (1) according to one of the preceding claims, characterized in that the support rollers (12, 13) are arranged on the handle (6) at a fixed distance from one another, based on the distance between the axes of rotation (14, 15) of the support rollers (12, 13), and in a fixed position relative to the handle (6) in the region of the rear longitudinal end (11) of the handle (6), and the adjusting device comprises a pivotable receptacle (27) for the rolling disc (8), by means of which the inclination of the rolling disc (8) and thus the angle of inclination (ß) of the rotation axis (5) can be adjusted, preferably lockable with a latch. Roller grinder (1) according to one of the preceding figures, characterized in that the support rollers (12, 13) are arranged at a fixed distance from one another, relative to the distance between the axes of rotation (14,15) of the support rollers (12, 13) are arranged at the radial end of a common radial arm (17) which is pivotably mounted relative to the rotational axis (5) of the roller grinder (1) by means of an arm joint (80) such that when the arm (17) is pivoted, the distance of the support rollers (12, 13) from the rotational axis,

[0172] (5) is adjustable. Roller grinder (1) according to the preceding item, characterized in that the boom (17) is adjustable by means of a cam control comprising a rotatable cam (81) arranged at the rear longitudinal end (11) of the roller grinder (1) with a cam groove (82) in which a driver (83) of the boom (17) is guided. Roller grinder (1) according to item 15 or 16, characterized in that the boom (17) is pivotable by means of the cam control into two positions, which correspond to the end positions of the pivoting range of the boom (17), and can be locked in these end positions, preferably with a latching action. Roller grinder (1) according to the preceding item, characterized in that the cam control has a latching action, by means of which the boom (17) can be locked in one or more intermediate positions between the end positions. Roller grinder (1) according to one of the preceding items,characterized in that the machining disc (10) is detachably fastened to the rolling disc (8) by means of a force-locking connection, and preferably has at least one elastic element on its circumference, in particular an elastic ring or O-ring (20) inserted into a circumferential groove (19), with which it can be inserted into a corresponding end-face receptacle of the rolling disc (8) and clamped therein. Roll grinder (1) according to the preceding paragraph, characterized in that for removing a machining disc (10) detachably inserted into the rolling disc (8) by means of a force-locking connection, the rolling disc (8) has an opening arranged such that with a finger inserted through the opening, the rear side, i.e. the side of the machining disc (10) facing axially towards the handle (6),accessible and the processing disc (10) can be pressed out of the rolling disc (8) by finger pressure directed axially away from the handle (6). A roller grinder (1) according to item 19 or 20, characterized in that the roller grinder (1) has an ejection rod (21) arranged in the axial direction of the handle (6) such that, upon actuation in the axial direction, it presses against the rear side of the processing disc (10) facing the rolling disc (8) and thereby axially pushes the processing disc (10) out of the rolling disc (8). A roller grinder (1) according to the preceding item, characterized in that the ejection rod (21) is held in its initial position by spring loading and / or that the ejection rod (21) protrudes from the handle (6) at the rear longitudinal end (11) of the handle (6) with one end so far thatthat it is axially displaceable for ejecting a machining disc (10) from the rolling disc (8) by means of axial finger pressure on the end of the ejection rod (21). A roller grinder (1) according to one of the preceding claims, characterized in that the axial end face of the rolling disc (8) is designed such that the machining disc (10) rests on the rolling disc (8) only at its radial edge, and a central region of the machining disc (10) has no contact with the rolling disc (8). A roller grinder set comprising a roller grinder (1) according to one of the preceding claims and a grinding aid (35) which is to be arranged on a flat base (23) with a support plane defined on its underside and is intended and designed to hold a cutting tool to be machined with the roller grinder (1) in a fixed position and at a predetermined positioning angle relative to this base (23).so that a roller grinder (1) rolling back and forth on this support (23) and resting against the cutting edge (47) of the cutting tool with a rotating processing disk (10) can machine the cutting edge (47), and is characterized in that the grinding aid (35) is designed such that the positioning angle of the blade (46) of the cutting tool relative to the support plane is 90°, and in that the grinding aid (35) has a purely mechanically acting, manually operable clamping device for clamping and holding the blade (46), which has a contact surface (36) fixed in the grinding aid (35) and oriented perpendicular to the support plane for contacting one side of the blade (46), and a pressure surface (38) manually displaceable parallel to the support plane and oriented parallel to the contact surface (36) for pressing the other side of the blade (46). Roller grinder set according to the preceding paragraph, characterized in thatthat the grinding aid (35) forms a flat, substantially cuboid-shaped body having a flat underside and a top side spaced therefrom, which can have the same length as the underside, and having at least one narrow side (39) on which the pressure surface (38) is arranged, wherein, for clamping a cutting tool in the gap between the pressure surface (38) and the contact surface (36), the pressure surface (38) is displaceable by means of the clamping device in the direction of the contact surface (36). A roller grinder set according to item 24 or 25, characterized in that the clamping device and its actuating elements are arranged in and / or on a housing, which is preferably cuboid-shaped, and the displaceable pressure surface (38) is arranged on a narrow side of the housing. A roller grinder set according to one of items 24 to 26, characterized in that the contact surface (36) is designed as part of a retaining bracket,wherein one leg of the holding bracket forms or supports the contact surface (36) and the other leg is fastened to a housing of the grinding aid (35), and wherein the pressure surface (38) is displaceable by means of the clamping device. A roller grinder set according to any one of numbers 24 to 26, characterized in that the contact surface (36) is formed on a housing of the grinding aid (35), and the pressure surface (38) is formed as part of a holding bracket, wherein one leg of the holding bracket forms or supports the pressure surface (38), and the other leg is displaceable by means of the clamping device. A roller grinder set according to any one of numbers 24 to 28, characterized in that the clamping device comprises a spring (40) for providing the clamping force required to hold a cutting tool to be machined, wherein the cutting tool is pressed against the contact surface (36) by means of the force exerted by the spring (40) on the pressure surface (38).and to release the cutting tool, the clamping device can be manually actuated against the spring force. A roller grinder set according to any one of items 24 to 28, characterized in that the clamping device is designed such that the clamping force required to hold a cutting tool to be machined is generated by pressing the pressure surface (38) against the contact surface (36) by means of a manual force acting on the pressure surface (38), and to release the cutting tool, this manual force is reduced. A roller grinder set according to any one of items 24 to 30, characterized in that the contact surface (36) and / or the pressure surface (38) has an elastically designed surface, in particular is made of plastic and / or has individual contact elements made of an elastomer and / or a coating with an elastomer. A roller grinder set,comprising a roller grinder (1) according to one of numbers 1 to 19 and a processing disc (10) which is circular in design, intended and designed for attachment to a roller grinder (1), and on which a processing surface (2) for processing the cutting edge (47) of a cutting tool is formed on an axial end face, and is characterized in that it is designed such that it can be detachably attached to the rolling disc (8) by means of a force-fitting connection, and for this purpose has at least one elastic element on its circumference, in particular an elastic ring or O-ring inserted into a circumferential groove, with which it can be inserted into a corresponding end-face receptacle of the rolling disc (8) and clamped therein. Roller grinder set, comprising a roller grinder (1) according to one of numbers 1 to 23 and a processing disc (10) which is circular in design,provided and designed for attachment to a roller grinder (1) and on which a machining surface (2) for machining the cutting edge (47) of a cutting tool is formed on an axial end face, and is characterized in that the machining disc (10) is designed such that it rests on the rolling disc (8) only at its radial edge, and a central region of the machining disc (10) has no contact with the rolling disc (8). A roller grinder set, comprising a roller grinder (1) according to one of numbers 1 to 19 and a machining disc (10) which is circular in design, provided and designed for attachment to a roller grinder (1), and on which a machining surface (2) for machining the cutting edge (47) of a cutting tool is formed on an axial end face, and is characterized in that the machining disc (10) has a machining surface (2, 2a) on both sides. A roller grinder set,comprising a roller grinder (1) according to one of numbers 1 to 23 and a machining disc (10) which is circular in shape, provided and designed for attachment to a roller grinder (1), and on which a machining surface (2) for machining the cutting edge (47) of a cutting tool is formed on an axial end face, and is characterized in that the machining disc (10) has two machining surfaces (2, 2a) which are connected to one another in a form-fitting and material-fitting manner. A roller grinder set comprising a roller grinder (1) according to one of numbers 1 to 23 and a machining disc (10) which is circular in shape, provided and designed for attachment to a roller grinder (1), and on which a machining surface (2) for machining the cutting edge (47) of a cutting tool is formed on an axial end face, and is characterized in that the machining disc (10) has a machining surface (2),which is positively and materially connected to the processing disk (10). Roll grinder set, comprising a roll grinder (1) according to one of numbers 1 to 23 and a processing disk (10) which is circular in design, provided and designed for attachment to a roll grinder (1), and on which a processing surface (2) for processing the cutting edge (47) of a cutting tool is formed on an axial end face, and is characterized in that the processing disk (10) has a processing surface (2) on only one side, and the processing surface (2) is positively connected to the processing disk (10). Roll grinder set, comprising a roll grinder (1) according to one of numbers 1 to 23 and a processing disk (10) which is circular in design,intended and designed for attachment to a roller grinder (1) and on which a machining surface (2) for machining the cutting edge (47) of a cutting tool is formed on an axial end face, and is characterized in that the machining disc (10) is tempered.

[0173] List of reference symbols Roller grinder Machining surface a Machining surface Longitudinal direction Bearing body Rotation axis Handle piece Front longitudinal end Rolling disc Friction element 0 Machining disc 1 Rear longitudinal end 2 Support roller 3 Support roller 4 Rotation axis to 12 5 Rotation axis to 13 6 Support plane 7 Boom 7a Boom 8 Swivel axis 9 Groove 0 O-ring Ejector rod Latch Base Compression spring Latch pin Recess Swivel mount Base Swivel axis Cross pin Latch lever Latch pin Bearing Auxiliary spring Grinding aid Contact surface Pressure surface Narrow side Spring Actuating button Clamp slider Tray Holding recess Elastomer pad Blade Cutting edge Supporting layer Boom joint Cam disc Cam disc groove Driver Adjusting wheel Wave washer 6 Actuating element 7 Ball bearing

[0174] 88 pressure piece

[0175] 89 locking position

[0176] 90 curved track

[0177] 91 Suspension

[0178] 92 clamp slide

[0179] 93 floor panel

[0180] 94 pushrod

[0181] 95 backdrop

[0182] 96 eccentric

[0183] 97 Intermediate piece

[0184] 98 Axis

[0185] 99 ball pressing piece

[0186] 100 disc magnets

[0187] 101 rotary handle ff

[0188] 102 centering pins

[0189] 103 Actuator ß Inclination angle

Claims

Patent claims 1. A roller grinder (1) for manually machining the cutting edge (47) of a cutting tool, in particular a knife, by means of a machining surface (2) fastened to the roller grinder (1) and designed for grinding, polishing, deburring or honing the cutting edge (47), comprising a bearing body (4) extending in an axial longitudinal direction (3), in which a rotational axis (5) is arranged that is rotatable relative to the bearing body (4) about its axial longitudinal direction (3), wherein the bearing body (4) is designed as a handle (6) that can be grasped by a user of the roller grinder (1) with the fingers of one hand, a circular rolling disc (8) attached to a front longitudinal end (7) of the handle (6) and mounted rotatably about the rotational axis (5) relative to the handle (6), wherein the rolling disc (8) has on its radial outer side a circumferential, the rolling disc (8) along its circumference has a friction element (9) whose radial outer diameter is larger than the radial outer diameter of the area of ​​the handle (6) which borders on the rolling disc (8) in the axial direction, so that the friction element (9) at the front longitudinal end (7) of the roller grinder (1) protrudes radially beyond the rolling disc (8) and the handle (6), and a circular processing disc (10) which is fastened to the axial outer side of the rolling disc (8) on the front longitudinal end (7) of the roller grinder (1) axially on the outside, i.e. axially pointing away from the handle (6), about the rotation axis (5) and is rotatable together with the rolling disc (8) and on whose axially outer side, i.e. axially pointing away from the handle (6), the machining surface (2) for machining the cutting edge (47) of a cutting tool is formed, wherein the machining disc (10) has a radial outer diameter which is smaller than the radial outer diameter of the friction element (9), characterized in that the roller grinder (1) in the region of the rear longitudinal end facing away from the rolling disc (8) (11) of the handle (6) has at least two support rollers (12, 13), wherein the support rollers (12, 13), the roller rotation axes (14, 15) or the roller bearings are arranged at a distance from the rotation axis (5), and has an adjusting device integrated in the roller grinder (1), by means of which the inclination angle of rotation (ß) of the axis of rotation (5) of the roller grinder (1) against a base (23) on which the roller grinder (1) rests during its intended use with the friction element (9) and the support rollers (12, 13), can be set to at least one value different from zero, wherein the distance of the support rollers (12, 13) from the axis of rotation (5) is greater than the distance of the radial outer diameter of the friction element (9) from the axis of rotation (5), so that the distance of the axis of rotation (5) running obliquely to the base (23) from the base (23) is smaller at the front longitudinal end (7) than at the rear longitudinal end (11).

2. Roller grinder (1) according to claim 1, characterized in that the distance between the planes in which the at least two support rollers (12, 13) rotate is less than 2 cm, preferably less than 1 cm and particularly preferably less than 0.5 cm.

3. Roller grinder (1) according to one of the preceding claims, characterized in that the angle of inclination (ß) of the rotation axis (5) is continuously or stepwise adjustable between different positions.

4. Roller grinder (1) according to one of the preceding claims, characterized in that the angle of inclination (ß) of the rotation axis (5) is adjustable to values ​​between 0° and 30° and / or to values ​​between 0° and 10° and / or to values ​​between 10° and 30°.

5. Roller grinder (1) according to one of the preceding claims, characterized in that the support rollers (12, 13) are arranged at a fixed distance from one another, based on the distance between the axes of rotation (14, 15) of the support rollers (12, 13), on the radial end of a radial arm (17) which can be pivoted about a pivot axis (18) offset parallel to the axis of rotation (5) in such a way that the resulting eccentric pivoting of the support rollers (12, 13) adjustably changes their distance from the axis of rotation (5), wherein preferably the arm (17) can be pivoted into two positions which correspond to the end positions of the pivoting range of the arm (17), and can preferably be locked in place there.

6. Roller grinder (1) according to one of the preceding claims, characterized in that the support rollers (12, 13) are arranged at a fixed distance from one another, based on the distance between the axes of rotation (14, 15) of the support rollers (12, 13), on the radial end of a radial arm (17), which is part of a link (95) or is connected to a link (95) which can be moved out of the handle (6) and into the handle (6) by means of an eccentric (96) in such a way that the distance between the support rollers (12, 13) and the axis of rotation (5) changes in an adjustable manner, wherein the link (95) can preferably be locked in two or more positions.

7. Roller grinder (1) according to one of the preceding claims, characterized in that the support rollers (12, 13) with a variably adjustable distance from each other, based on the distance between the axes of rotation (14, 15) the support rollers (12, 13) are each arranged at the radial end of a radial arm (17, 17a), wherein at least one arm (17) is pivotable about the axis of rotation (5) in such a way that the resulting spreading out or closing of the arms (17, 17a) changes the distance between the support rollers (12, 13) and thus the angle of inclination (ß) of the axis of rotation (5) in an adjustable manner.

8. Roller grinder (1) according to the preceding claim, characterized in that one arm (17a) is fixedly connected to the handle (6) relative to the latter and the other arm (17) is pivotable, preferably lockable.

9. Roller grinder (1) according to one of the preceding claims, characterized in that the support rollers (12, 13) are arranged at a fixed distance from one another, based on the distance between the axes of rotation (14, 15) of the support rollers (12, 13), and in a fixed position relative to the handle (6) in the region of the rear longitudinal end (11) of the handle (6) on the handle (6), and the adjusting device comprises a pivotable receptacle (27) for the rolling disc (8), by means of which the inclination of the rolling disc (8) and thus the angle of inclination (ß) of the axis of rotation (5) can be adjusted, preferably lockable.

10. Roller grinder (1) according to one of the preceding claims, characterized in that the support rollers (12, 13) are arranged at a fixed distance from one another, relative to the distance between the axes of rotation (14, 15) of the support rollers (12, 13) are arranged at the radial end of a common radial arm (17) which is pivotably mounted relative to the rotational axis (5) of the roller grinder (1) by means of an arm joint (80) in such a way that when the arm (17) is pivoted, the distance of the support rollers (12, 13) from the rotational axis (5) changes in an adjustable manner.

11. Roller grinder (1) according to the preceding claim, characterized in that the boom (17) is adjustable by means of a cam control which comprises a rotatable cam disc (81) arranged at the rear longitudinal end (11) of the roller grinder (1) with a cam disc groove (82) in which a driver (83) of the boom (17) is guided.

12. Roll grinder (1) according to one of the preceding claims, characterized in that the processing disc (10) can be detachably fastened to the rolling disc (8) by means of a force-fitting connection, and preferably for this purpose has at least one elastic element on its circumference, in particular an elastic ring or O-ring (20) inserted into a circumferential groove (19), with which it can be inserted into a corresponding end-face receptacle of the rolling disc (8) and clamped therein.

13. Roller grinder (1) according to the preceding claim, characterized in that the roller grinder (1) has an ejection rod (21) which is arranged in the axial direction of the handle (6) in such a way that, when actuated in the axial direction, it points to the ejection rod (21). rolling disc (8) facing the back of the processing disc (10) and thereby presses the processing disc (10) axially out of the rolling disc (8).

14. Roll grinder (1) according to one of the preceding claims, characterized in that the axial end face of the rolling disc (8) is designed such that the machining disc (10) rests on the rolling disc (8) only at its radial edge and a central region of the machining disc (10) has no contact with the rolling disc (8).

15. A roller grinder set comprising a roller grinder (1) according to one of the preceding claims and a grinding aid (35) which is to be arranged on a flat base (23) with a support plane defined on its underside and is provided and designed to hold a cutting tool to be machined with the roller grinder (1) in a fixed position and at a predetermined positioning angle relative to this base (23), so that a roller grinder (1) rolling back and forth on this base (23) and resting with a rotating machining disk (10) on the cutting edge (47) of the cutting tool can machine the cutting edge (47), and is characterized in that the grinding aid (35) is designed such that the positioning angle of the blade (46) of the cutting tool relative to the support plane is 90° and that the grinding aid (35) for clamping and holding the blade (46) has a purely mechanically acting,manually operable clamping device which has a fixed in the grinding aid (35), perpendicular to the, Support surface (36) aligned with the support plane for applying one side of the blade (46) and a pressure surface (38) which can be moved manually and parallel to the support plane and is aligned parallel to the contact surface (36) for pressing onto the other side of the blade (46).

16. A roller grinder set comprising a roller grinder (1) according to one of claims 1 to 14 and a machining disc (10) which is circular in design, provided and designed for attachment to a roller grinder (1) and on which a machining surface (2) for machining the cutting edge (47) of a cutting tool is designed on an axial end face, and is characterized in that it is designed such that it can be detachably attached to the rolling disc (8) by means of a force-fitting connection, and for this purpose has at least one elastic element on its circumference, in particular an elastic ring or O-ring inserted into a circumferential groove, with which it can be inserted into a corresponding end-face receptacle of the rolling disc (8) and clamped therein.

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